07-19-2011, 11:54 AM
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A comment or two on the response from Eheim. First, they are being very general and cannot be factoring in the aquascape and fish species. Of course any filter rated as "up to 90g" will filter a 27g tank, that is not the issue. The fish determine the filter, or should if we want to provide them with the best.
I have a Magnum canister that I bought for my 33g way back when, my first canister. It is far too powerful for that size tank. I now have an Eheim sponge filter [they don't make these any more, pity, because it is a superb filter, a simple sponge inside a small canister with a little motor, hangs in the corner of the tank] on this tank, and the Magnum is in a box as my backup spare filter should one of the other filters ever give out.
If there are going to be fish in a tank for 5 years they deserve appropriate water flow or they won't last 5 years.