03-07-2012, 08:49 PM
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Apistos, Convicts, Rams (either german or bolivian), dwarf cockatoo, checkerboards, kribs, dwarf cichlids of basically any type Jewel might also work and if you are going to upgrade the 50 to a 75 you could get by with a Firemouth
for a while in a 20 though i wouldn't advise it. You never know of any problems that might happen with upgrades. Convicts and Jewel cichlids wouldnt really allow you to have any other tank mates anyway. They both tend to be really aggressive. The others you tend to be more of "community" type cichlids though it all depends on the personality. As for the convicts you could get a breeding pair and call it a day, assuming you have some way to get rid of the copious amounts of fry you will have (cull, sell, feeder fish etc...) and have a spare tank for a grow out tank.