Seachem Tidal 55 Review
A hang-on-back with a big open media basket, a built-in surface skimmer and a self-priming Sicce pump. It filters like a small canister but hangs on the rim in seconds.
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👍 Pros
- Huge open media basket — pack it your way with foam, matrix and carbon
- Built-in adjustable surface skimmer clears the oily film off the water
- Self-priming Sicce pump: fill, plug in, and it starts itself
- Flow dial and a maintenance-reminder that tells you when to service
👎 Cons
- Bulkier and pricier than a basic cartridge HOB
- The intake and box are visible on the back glass
- Skimmer needs a little tuning to sit at the right water level
A hang-on-back that filters like a canister
Most hang-on-backs make you choose between simplicity and real filtration. The Seachem Tidal 55 refuses to. Its large open media basket holds far more than a cartridge HOB, and you fill it your own way — foam for mechanical, Matrix or ceramic for biological, carbon only when a job calls for it. A self-priming Sicce pump means you fill the tank, plug it in, and it starts itself; no cup of water to prime.
The skimmer is the party trick
The feature that sets the Tidal apart is its built-in surface skimmer. It pulls water from the top film as well as from depth, so the oily protein layer that dulls a still surface never gets a chance to form. On a planted tank or any setup without much surface agitation, that means better gas exchange and glass-clear water viewed from above. A flow dial lets you throttle it down for timid fish, while still holding the 4× turnover you want for clean water on a 200 L tank.
HOB, internal or canister?
If you want the simplest possible HOB with a refillable basket, the AquaClear 50 is cheaper and nearly as flexible. Need to filter a bigger or planted display with no box on the glass? A canister like the Fluval 207 hides under the cabinet. But for a 100–200 L tank where you want maximum media and a clean surface, the Tidal 55 is the pick. Compare all three types on our aquarium filters hub, and match the filter to the tank on our aquariums page.
The most capable hang-on-back we recommend. The open basket, self-priming pump and surface skimmer give you canister-like control and a cleaner surface, all without cabinet plumbing.
Seachem Tidal 55 — frequently asked questions
What does the surface skimmer actually do?
It draws water from the very top of the tank as well as lower down, pulling in the oily protein film that otherwise builds on a still surface. That improves gas exchange and keeps the water looking clear from above — genuinely useful on a planted or lightly-aerated tank.
Is the Tidal 55 enough filter for a 200 L tank?
Yes for a normally-stocked one. At 900 L/h it gives you roughly 4× turnover on a 200 L tank, which is the clarity target we aim for. Its big media basket also holds more biological media than most HOBs, so it punches above a cartridge filter of the same rating.
Do I need Seachem media to use it?
No. The basket is open, so you can run any media you like — the stock foam plus your choice of bio media (Seachem Matrix, ceramic noodles, whatever you have). Chemical media such as carbon is optional and only added when you need it.
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