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I agree!!DrRob said:First up, ignore the ratings, get the filter you want, not what they suggest. Pretty much all of them over sell their filters. I'm currently setting up an eheim rated for 100l tanks on a 30l and am perfectly happy with that. My 90l tank has a filter that officially turns over 2000lph (but it doesn't, not even close).
A lot of it will depend on the tank set up you want, the more scape, be it plants or hardscape, the more punch you will need to keep the flow going over the whole tank. Overfiltering is pretty much impossible, over doing the flow is possible, but is redeemable with the right outlets and spray bars.
britt said:What is the best canister filter for a 20g I was looking at eheim classic rated for 66g just incase I upgrade tanks.