Exceptional filtration in aquariums up to 55 US gallons (200 Liters)


Tidal™ Power Filters are designed from the ground up to provide your aquarium with high-quality, comprehensive filtration. They are easy to use and adaptable to a variety of aquarium conditions. With a host of features including a self-priming pump, dual water intake with surface skimmer, adjustable flow, maintenance monitor, self-cleaning impeller, and a filter basket that holds any kind of filtration media - and more of it - Tidal™ Power Filters are designed to deliver the highest water quality possible with maximum versatility and ease of use.



Fully adjustable flow regulation

Fully adjustable flow regulation adjusts performance to a specific aquarium volume, type, or provide an environment for fish which prefer more or less water movement or oxygenation. Adjust using the dial on the front, for a powerful full flow rate of 450 gallons per hour on the Tidal 110 down to a gentle 90 gallons per hour on the same filter.


Surface skimmer

The surface skimmer will capture the water from just below the surface, where excreted fish oils accumulate, as well as deeper in the tank removing floating debris


Adjustable intake flow

With Tidal's dual intake, it pulls water in through the telescoping pipe below the surface and at the surface through the surface skimmer. Easily adjust how much flow comes from the underwater intake pipe versus the surface skimmer with the intake flow dial.

Not available on Tidal 35 units


Heater holder

A heater can be attached to the side with an optional heater clip, allowing for better dispersal of heated water through the aquarium

Not available on Tidal 35 units


Maintenance alert

Over time, filtration media can become clogged with detritus reducing or obstructing the flow of water through it. When this happens in Tidal™ filters, water is redirected around the filter and back into the aquarium through an outlet on the side. The redirected water pushes up the blue maintenance alert on the top of the filter, signaling that the filter needs to be cleaned.


No mess maintenance

The basket is fully removable and snaps into the lid of the filter for easy and drip-free transit to a sink or hose for cleaning.


Self-priming pump

The self-priming pump means there's no need to fill the filter basket with water, start a siphon, monitor the filter, or any of the other headaches of starting a new filter. This also means that after a power outage, the filter will automatically restart itself.




Length: 8 1⁄16 in (20.5 cm)
Width: 6 ⅛ in (15.5 cm)
Height: 8 ⅜ in (21.4 cm)

Media Chamber

Length: 7 ⅜ in (18.9 cm)
Width: 2 9⁄16 in (6.6 cm)
Height: 5 ⅞ in (15 cm)

Wall Clearance

3 in (7.5 cm)

Tank Trim Clearance

1 in (2.6 cm)

Internal Tank Clearance

1 11⁄16 in (4.3 cm)

Technical Specifications

Aquarium Size

Up to 55 US gallons (200 Liters)

Flow Rate

250 US GPH (1000 L/H)


6 - (120 v - 60 Hz)
5 - (230 v - 50 Hz)

Filter Volume

0.32 US gallons (1.2 Liters)

Features at a Glance

  • Reversible filter cover
  • Maintenance alert device
  • Overflow prevention
  • Large-capacity filter basket
  • Aerating return flow
  • Flow regulation
  • Intake flow regulation
  • Surface skimmer
  • Sub-surface intake
  • Telescoping intake pipe
  • Leveling dial
  • Self-priming pump
  • Self-cleaning impeller
  • Heater holder

Package Contents

  • Tidal 55 Filter
  • Heater holder
  • Telescoping intake pipe
  • Leveling dial
  • Foam filter
  • Matrix™ bio-media
  • Instruction Manual

Warranty Information

3 Year Warranty

All Tidal™ Filters are guaranteed against defects of materials and workmanship for a period of 3 years from the date of purchase, except for the pump’s impeller. This can be extended to 5 years by registering your filter.

Seachem Tidal 55