01-24-2009, 01:52 PM
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I use a duetto 50 internal filter with the outlet pointed at the tank wall in my betta tank. That works pretty well in a 5 gallon tank. In a 10, I would use 2 or a duetto 100.
I think you're fooling yourself if you think you're going to be able to get larger tanks ready as the gibby needs them, but I admit I could be wrong. Just make sure you get him out of the 10 before he hits 3", and out of the 30 and into a 75 or larger before he hits 6". You'll need to up that to a 180 by the time he hits 12"; ideally you want at least a 6x2' footprint for a fully grown gibby, and that's the smallest tank I know of with that footprint. You could get by with a 120, I suppose (4x2x2) or one of the ones with a 5' x 18" footprint (less commonly available), but 6x2 or larger is really ideal.
Unless you are planning a tank full of monster fish, why are you looking at a gibby in any case? I understand that they're attractive fish, but there are many, many other plecos that are just as attractive and interesting, and typically do a better job with algae, that stay under a 8", which is about the largest size you would want in a 55 gallon (or even a 75 for that matter.)