Seachem Tidal 35 Power Filter
The best all-rounder here: it skims the surface film, self-primes after an outage, and takes bulk media in a big basket — and it is the highest-rated filter in the group.
- +Surface skimming pulls the oily film off the top
- +Self-priming — restarts after a power outage
- +Large refillable media basket — no cartridge lock-in, bulk media compatible
- +Adjustable flow control
- +Easy to clean with a maintenance reminder
- −Impeller can rattle until it beds in
- −Intake gets loud if the water level drops
This is the Seachem Tidal 35, a hang-on-back power filter rated up to 35 gallons at about 130 GPH. It has a surface skimmer, a self-priming pump that restarts after a power cut, a large refillable media basket with no proprietary cartridges, adjustable flow, and a maintenance reminder.
- Freshwater and planted tanks up to about 35 gallons
- Keepers who want to run their own bulk media rather than buy cartridges
- Tanks with an oily surface film, which the skimmer clears
- Setups that suffer power outages, since it self-primes on restart
- Nano tanks where 130 GPH is too strong, unless you turn the flow down or pick a smaller model
- Anyone wanting canister-level media volume
- Very tall tanks where a hang-on-back intake cannot reach the bottom
- Keepers expecting silence out of the box, since the impeller beds in over a few days
We separate what the maker claims from what independent sources confirm, what owners report, and where we are drawing an inference. We do not bench-test products.
- About 130 GPH, rated up to 35 gallons
- Surface skimmer and self-priming pump
- Large refillable media basket
- Adjustable flow and a maintenance reminder
- It takes bulk, refillable media, not proprietary cartridges
- The intake includes a surface-skimming attachment
- It restarts itself after a power interruption
- The highest-rated filter in its group, praised for the media basket and skimmer
- Some report impeller rattle until it beds in, and intake noise if the water level drops
- The refillable basket is the real win: you control the media mix and the cost, and can tune biological, chemical and mechanical filtration
- The adjustable flow makes it usable in smaller tanks despite the rating
The filter is a one-time cost; the only ongoing cost is media you choose. Because there is no cartridge lock-in, running cost is low: a sponge is rinsed and reused rather than replaced, biomedia lasts indefinitely, and chemical media is optional. Electricity draw is minimal.
- Impeller rattle on a new unit, which usually beds in; if it persists, clean the impeller and its well
- The intake sucks air and gets loud if the water drops below it, so top up or lower the intake
- The surface skimmer clogs with debris and needs an occasional rinse
- Rinsing away all your biomedia at once can crash the cycle, so clean in tank water and stagger it
We do not bench-test flow or filtration. Ratings are Seachem's stated figures with aggregated owner feedback. We give gear guidance only, not stocking or disease advice.
No. It has a large refillable basket, so you run bulk media such as sponge, biomedia and carbon, and are never locked into buying cartridges.
For a heavily planted or nano tank it can be strong, but the adjustable flow dial turns it down, or you can step to a smaller Tidal model.
Yes. It self-primes, which is a real advantage over filters that need manual re-priming after an outage.
The impeller often rattles until it beds in over a few days. If it continues, pull and clean the impeller and its housing.