Tetra Whisper 20i In-Tank Filter

[bluerose]

Any good?

Aquarium Filters: Whisper In-Tank Filters

[OldMan]

That style of filter works OK but I would limit a 20i to serving a 10 to 15 gallon tank. It will force you to run the water level a little lower than most filters as you can see in the Drs F & S advertising picture. As with most filter makers, the Whisper internal series is overrated by the manufacturer. For almost the same money you can get a Whisper EX series that has some nice features to it and for a little more you can get one of the well respected AC HOB filters.