

Tanks with less fish or lightly stocked will do just fine with a smaller filter than mentioned above. This is for normally stocked to heavily stocked tanks. Always best to have slower water flow over your media than more, so the water stays in contact with the media longer to promote maximum bacteria growth/filtration and still keeps good water movement in your tank. Canister filters hold more media than a HOB, so they can have a little less flow if you want (5x-6x) but 8x will cover both types of filters.

This is why you should get a filter with at least 8x-10x flow rate ( manufactures specification) because of this 50-60% reduction will bring you to the 4x recommended flow. Which now leaves you at 2x your flow rate and you need 4x to run correctly. So now you have a 50-60% restriction in water flow. Now add all your media which is jam packed with course, medium, fine pads, bio ceramic rings, porous large surface area media like Matrix, Biohome or Marine Pure Media and now it gets dirty and clogged in weeks. All this alone will reduce the flow by at least 25% right out of the box. This means their ratings do not include head pump lift (canisters typically 3-4 feet: 7-13% head loss alone), filter media baskets, filter media itself, tubing length, U bends from the input tube and output tubes or even the 90 degree bend for your spray bar. All manufactures rate their pumps at the head level only. The general rule of thumb is your fish tank should turn over your water volume at least 4x per hour for best efficiency. You want about 600-750 gph for your 75 gallon tank for best efficiently. The 75 and 110 have the same mechanism.įor my 75 gallon tank I have a Sunsun canister 303B at 370 gph and a Tidal 75 at 350 gph. For Tidal 75 and 110, where the impeller goes that continuously flushes a little bit of water through the back to keep it cool and quite clean. There is a groove in the Tidal 55 that goes through the slot where the impeller stays and it will continuously clean the impeller of any debris or buildup. From Seachem Support: The self cleaning feature of the Tidal Filters can be explained by the structure and build of the impeller housing. Includes the best media, Seachem Matrix, that can harbor anaerobic bacteria needed to reduce Nitrates.Self priming w/submerged under water pump so it’s quiet and you never have to worry about it not starting or recovering from maintenance or a power failure, especially if you are not home.No need to turn the filter off either just remove the basket. Removable no spill media basket comes out for easy just cleaning using the lid as a no spill carrying tray.Media basket locks in place so it will never rise up pushing the media cage up possibly causing an overflow and flooding your floor.


The Seachem Tidal filters have these advantages over all other HOB filters. I might suggest a Seachem Tidal Filters for just some of the following advantages:
