Beginner Aquarium Maintenance: Weekly and Monthly Checklist.

Regular aquarium maintenance does not need to be complicated.

A simple routine of checking your fish, testing water, completing partial water changes and maintaining the filter can go a long way towards keeping a freshwater aquarium stable and healthy.

This beginner aquarium maintenance checklist explains what to check daily, weekly and monthly, and which jobs should only be done when they are actually needed.

If you are still setting up your first tank, start with our beginner guide to setting up your first aquarium, then read our guides to cycling a new fish tank and freshwater aquarium equipment.

Why Regular Aquarium Maintenance Matters

An aquarium is a closed environment. Fish waste, uneaten food, plant debris and other organic material can gradually affect water quality if they are not managed.

Regular maintenance helps:

• Remove accumulated waste.
• Control nitrate and other dissolved waste products.
• Keep the filter working efficiently.
• Maintain more stable water conditions.
• Reduce excessive algae and debris.
• Identify equipment or fish-health problems early.

RSPCA Australia recommends routine partial water changes and gravel cleaning for established freshwater aquariums, while Merck also highlights water-quality monitoring, cleaning and filter maintenance as key parts of preventive fish care. :chatgpt-content-reference{index="1"}

Daily Aquarium Maintenance

Daily maintenance should only take a few minutes.

Check Your Fish

Take a moment to observe your fish before or during feeding.

Look for changes such as:

• Reduced appetite.
• Rapid breathing.
• Gasping near the surface.
• Clamped fins.
• Unusual swimming.
• White spots, marks or lesions.
• Unexpected aggression.
• Fish hiding more than usual.

Knowing what normal behaviour looks like in your aquarium makes it much easier to notice when something changes.

Check the Temperature

Confirm that the aquarium temperature is appropriate for the species you are keeping.

If you use a heater, check that it is operating normally and that the actual water temperature matches the intended range.

Browse our aquarium heaters if your setup requires stable heated water.

Check the Filter and Water Flow

Make sure the filter is running and water flow has not dropped unexpectedly.

A sudden reduction in flow can indicate:

• Clogged mechanical media.
• Debris around the intake.
• A blocked impeller.
• A problem with the filter or power supply.

Do not wait until the filter completely stops before investigating reduced flow.

Feed Appropriately

Feed food suited to the species in the aquarium and avoid routinely adding more than the fish can consume.

Excess food eventually breaks down and contributes to waste in the aquarium.

Browse our fish food range for freshwater aquarium species.

Weekly Aquarium Maintenance Checklist

For many established freshwater aquariums, the weekly routine is where most regular maintenance happens.

1. Test the Water

Water testing helps you understand what is happening in the aquarium rather than relying only on appearance.

Useful tests may include:

• Ammonia.
• Nitrite.
• Nitrate.
• pH.
• GH or KH where relevant to the fish being kept.

RSPCA Australia suggests that once the biological filter is established, water testing every one to two weeks can help confirm that filtration and stocking remain appropriate. :chatgpt-content-reference{index="2"}

Test more frequently in a new aquarium or whenever fish behaviour, water clarity or equipment performance changes.

2. Complete a Partial Water Change

Regular partial water changes help remove dissolved waste and replenish the aquarium with fresh conditioned water.

RSPCA Australia recommends weekly partial water changes of around 10–25% for established freshwater aquariums, combined with gravel cleaning. The exact amount required can vary with stocking, feeding, filtration and water-test results. :chatgpt-content-reference{index="3"}

Avoid automatically replacing very large amounts of water unless there is a reason to do so.

Consistency is generally more useful than waiting until the tank appears dirty.

3. Use Water Conditioner

Treat replacement tap water with a suitable aquarium water conditioner where required.

Water conditioners are commonly used to neutralise chlorine and chloramine in tap water.

Follow the manufacturer's dosing instructions for the amount of new water being added.

4. Gravel Clean the Substrate

A gravel cleaner or siphon allows you to remove water and debris at the same time.

Concentrate on areas where waste tends to collect, such as:

• Open substrate.
• Around decorations.
• Behind rocks and driftwood.
• Low-flow areas.

Do not aggressively disturb deeply rooted plants or specialised substrates unless that is appropriate for the setup.

RSPCA recommends using a gravel siphon and a dedicated aquarium bucket rather than equipment that may have been exposed to household chemicals. :chatgpt-content-reference{index="4"}

5. Clean the Aquarium Glass

Remove algae from the inside of the glass using an aquarium-safe sponge, scraper or magnetic cleaner.

Never use household glass cleaner, soap or detergent inside the aquarium.

RSPCA specifically advises against using soap or detergents for aquarium cleaning because residues can be harmful to fish. :chatgpt-content-reference{index="5"}

6. Remove Dead Plant Material

If you keep live aquarium plants, remove dead or decaying leaves and trim plants as required.

Removing decomposing material helps reduce unnecessary organic waste in the aquarium.

7. Check Equipment

Inspect:

• Filter flow.
• Heater operation.
• Thermometer reading.
• Air pumps and air stones if used.
• Lighting.
• Power cords and plugs.
• Filter hoses or pipework.

Addressing a small equipment issue early is much easier than discovering a stopped filter or failed heater later.

Monthly Aquarium Maintenance Checklist

Monthly maintenance should be based on what the aquarium actually needs rather than treating every component as something that must be stripped down and cleaned on the same day.

1. Check and Clean the Filter if Needed

Filters need maintenance when flow drops or media becomes clogged with debris.

RSPCA Australia recommends lightly rinsing filter media in a bucket of aquarium water when it becomes clogged or around monthly, whichever occurs first. It also cautions against over-cleaning biological media because beneficial bacteria live there. :chatgpt-content-reference{index="6"}

For most established biological media, avoid rinsing it aggressively under untreated tap water.

2. Inspect Mechanical Filter Media

Mechanical media such as sponges and filter wool collects physical debris.

Check whether it needs:

• Rinsing.
• Repositioning.
• Replacing if it is no longer usable.

Do not automatically replace all biological filter media just because a calendar date has arrived.

3. Check the Impeller

If filter flow has reduced, inspect the impeller and impeller chamber for debris or buildup.

Follow the filter manufacturer's maintenance instructions because designs vary between internal, hang-on-back and canister filters.

4. Check Hoses and Pipework

External filters and other equipment with hoses can gradually accumulate algae and biofilm.

Check hoses for:

• Reduced flow.
• Kinks.
• Leaks.
• Heavy buildup.

5. Inspect Air Pumps and Air Stones

If you use an air pump, check that air flow is still adequate.

Air stones can gradually clog and may eventually need cleaning or replacement.

6. Review Your Stocking and Fish Growth

Fish do not remain the same size forever.

Periodically review:

• Adult size.
• Territorial behaviour.
• Schooling or group requirements.
• Available swimming space.
• Filter capacity.

If you are planning future livestock, browse our freshwater aquarium fish range and check the individual care requirements before adding anything new.

How Often Should You Clean an Aquarium Filter?

There is no single schedule that suits every filter.

A heavily stocked aquarium may clog mechanical media faster than a lightly stocked one.

Useful signs that filter maintenance is due include:

• Reduced water flow.
• Visible debris buildup.
• Noisy operation.
• Clogged mechanical media.

For many filters, light maintenance around monthly is a useful checkpoint, but flow and actual condition should guide you.

Should You Replace All Filter Media at Once?

Usually, no.

Much of the aquarium's beneficial bacterial population can live on biological filter media.

Replacing all mature media at once can substantially reduce biological filtration.

If a filter contains several different media types, service them according to their purpose and the manufacturer's directions rather than replacing everything together unnecessarily.

Browse our aquarium filtration range for replacement media and filter equipment.

Should You Wash Filter Media in Tap Water?

For established biological media, aquarium water removed during a water change is usually a safer choice for gentle rinsing.

RSPCA warns that chlorine or chloramine in untreated tap water can harm the beneficial bacteria in biological filter media. :chatgpt-content-reference{index="7"}

Do You Need to Remove Fish During a Water Change?

Usually not.

For routine partial water changes, fish can generally remain in the aquarium while you siphon carefully.

Avoid chasing the fish or moving equipment aggressively around them.

RSPCA notes that fish can remain in the aquarium during routine siphoning to minimise unnecessary stress. :chatgpt-content-reference{index="8"}

Top-Up Water Is Not the Same as a Water Change

When water evaporates, the water leaves but most dissolved minerals and waste products remain behind.

Simply topping up evaporated water does not remove nitrate or accumulated waste.

Merck warns that relying on top-ups instead of proper water changes can contribute to deteriorating water chemistry over time. :chatgpt-content-reference{index="9"}

Common Aquarium Maintenance Mistakes

Cleaning Everything at the Same Time

There is rarely a need to sterilise the entire aquarium.

Over-cleaning the substrate, filter and decorations all at once may unnecessarily disturb the aquarium's biological stability.

Using Soap or Detergent

Household cleaning products should not be used inside the aquarium or on equipment that will contact aquarium water.

Replacing Biological Media Too Often

Biological media is not the same as disposable mechanical filter wool.

If biological media is still structurally sound and functioning, it may only need gentle cleaning rather than routine replacement.

Waiting Until the Water Looks Dirty

An aquarium can look clear while still having poor water quality.

Use regular testing and maintenance rather than appearance alone.

Changing Too Much Water Without a Reason

Routine maintenance should be appropriate to the aquarium rather than automatically making very large changes every time.

Stocking level, water-test results and the needs of the fish should guide the routine.

Ignoring Reduced Filter Flow

A filter that is running poorly may not provide the water movement and filtration the aquarium normally relies on.

Investigate reduced flow rather than waiting until the filter stops completely.

Simple Beginner Aquarium Maintenance Schedule

Every Day

• Observe the fish.
• Check temperature.
• Check filter operation.
• Feed appropriately.
• Remove obvious uneaten food if needed.

Every Week

• Test water as appropriate.
• Complete a partial water change.
• Condition replacement water.
• Siphon debris from the substrate.
• Clean algae from the glass.
• Remove dead plant leaves.
• Check equipment and water flow.

Every Month or When Needed

• Inspect and lightly clean filter media.
• Check mechanical media.
• Inspect the filter impeller.
• Check hoses and pipework.
• Inspect air pumps and air stones.
• Review fish growth and stocking.

Keep the Routine Simple

A healthy aquarium does not usually need to be completely dismantled and cleaned.

A much better approach is to maintain it consistently:

• Observe the fish.
• Monitor water quality.
• Perform regular partial water changes.
• Remove accumulated waste.
• Keep the filter flowing properly.
• Avoid unnecessarily disturbing biological filtration.

Once this routine becomes familiar, aquarium maintenance is usually straightforward and predictable.

Continue the Beginner Aquarium Series

Read the other guides in our beginner aquarium series:

• Setting Up Your First Aquarium: A Beginner's Guide
• How to Cycle a Fish Tank Before Adding Fish
• What Equipment Do You Need for a Freshwater Aquarium?
• What Size Aquarium Should a Beginner Buy?

At Aquaholics Online, we stock aquarium filtration, aquarium heaters, fish food, live aquarium plants and freshwater aquarium equipment with Australia-wide delivery and our aquarium store at Baringa on the Sunshine Coast.

Frequently Asked Questions

How often should I change aquarium water?

For many established freshwater aquariums, a regular weekly partial water change is a useful starting point. RSPCA Australia recommends around 10–25%, but the appropriate amount depends on stocking, feeding, filtration and water-test results.

How often should I clean my aquarium filter?

Clean the filter when flow drops or media becomes clogged. A monthly inspection is useful for many setups, but the actual frequency depends on the aquarium and filter.

Can I wash aquarium filter media under the tap?

For established biological media, it is generally better to rinse it gently in removed aquarium water because untreated tap water may contain chlorine or chloramine that can harm beneficial bacteria.

Should I remove the fish while cleaning the tank?

Usually not for a normal partial water change. Fish can generally remain in the aquarium while you siphon carefully and avoid unnecessary disturbance.

Do I need to clean the entire aquarium every month?

No. Routine aquarium maintenance is usually about partial water changes, removing waste, cleaning the glass and servicing equipment as needed rather than completely stripping down the tank.