Seachem Tidal 75 External Hang-on Filter

Power up your aquarium clarity with the Seachem Tidal 75. This HOB filter offers true self‑priming, a built‑in surface skimmer, adjustable flow and intake control, and a large cartridge‑free media basket that includes Seachem Matrix for instant biofiltration. The bottom‑to‑top flow path maximises media contact for cleaner, clearer water in aquariums up to 300 litres.

Key benefits

• Self‑priming start‑up with self‑cleaning impeller for reliable restarts after water changes or outages.

• Dual intake with surface skimmer removes biofilm and floating debris while improving oxygenation.

• Bottom‑to‑top flow path maximises media contact, reducing bypass and boosting filtration efficiency.

• Pop‑up maintenance alert indicates when cleaning is due; safe overflow routes water back to the tank.

• Large, removable basket fits your choice of media; generous capacity for sponge, ceramics, carbon, or resins.

• Adjustable flow plus telescoping intake to target different tank depths and fine‑tune circulation.

• Quiet operation with aerating return and a levelling foot for a stable fit.

Specifications

• Tank size: Up to 300 L (75 US gal), freshwater or marine.
• Flow rate: 1500 L/h (350 GPH), adjustable.
• Power: 7 W at 230 V/50 Hz (approx.); low running cost.
• Filter volume: Approx. 1.9 L media capacity.
• Dimensions (approx.): 25.5 × 17.8 × 24.2 cm; wall clearance ~8.5 cm.

What’s in the box

• Tidal 75 filter unit with self‑priming pump and surface skimmer
• Large removable media basket
• Foam/sponge for mechanical filtration
• Seachem Matrix bio‑media
• Levelling dial, telescoping intake, heater holder clip

How it works
Tidal 75 pulls water from both the surface and subsurface, then forces it bottom‑to‑top through mechanical and biological media before returning it to the tank. This increases contact time, improves oxygenation, and maintains stable, clear water with less bypass than typical back‑to‑front HOB filters.

Setup tips

• Rinse media; stage sponge below biomedia (e.g., Matrix/ceramics) so mechanical precedes biological filtration.
• Start at mid‑flow; adjust upward as livestock tolerate to balance circulation, plant movement, and noise.
• Extend the telescoping intake to target mid‑ or lower‑water debris; tune the skimmer to clear surface film in 24–48 hours.
• Clean the sponge in dechlorinated tank water; avoid over‑cleaning biomedia to preserve beneficial bacteria.

Ideal for

• Medium to larger planted tanks, cichlids or goldfish with moderate bioload, and marine fish‑only or quarantine systems up to 300 L
• Hobbyists wanting cartridge‑free flexibility, strong yet adjustable flow, and simplified maintenance cues

Why choose Tidal 75
Compared to cartridge‑based HOBs, Tidal’s large, configurable basket and bottom‑to‑top flow minimise bypass and let you fine‑tune media for your water chemistry and stocking. The visible service alert and safe overflow simplify upkeep, delivering dependable performance day‑to‑day.

All Tidal Filters come with Seachem's Matrix bio-media to get you started.