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Hey guys, We have a 40g tank destined for 4 gfs soon. The filter is a Marineland Penguin 350, so it's a good, over-kill filter for goldfish, lol. Anyway, what do you guys recommend for an air pump? Do we really need one? There is a lot of surface agitation from the double water falls from the filter. We had a Tetra Whisper 60, but I was planning on getting a Whisper 20. Too small yes, but I figure the filter would make up for the smaller amount of surface agitation. Thanks a lot!