03-02-2007, 04:51 AM
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I don't think your tank will handle any other occupants very well. As it is, both your pleco and your ropefish would outgrow your current tank in the not so distant future even without the other occupants. I saw a recommendation that ropefish should be in a 55 gal tank minimum, another recommendation was for 100gal minimum, and it will eventually get big enough that it will eat your tetras and corys at a minimum. As for common plecos, they will grow to well over a foot long, so your current situation is not going to be viable long term, and you're probably at about max capacity right now, depending on how big your fish are. Even assuming that you remove the pleco and ropefish (which you will have to do eventually no matter what), the rest of your fish will be about all that a 20 gallon can handle when they get to full size, and with those species, it won't take long. You probably bought the tetras, gourami, and corys at close to adult size. If you're set on getting those other critters, you'll have to get a new tank, and it will have to be significantly bigger if you plan on keeping the ropefish and pleco for very long!