Hello everyone. So to start off with I'm just getting into having an aquarium. I have had a 10 gallon for about a year with fancy tail guppies & a zebra pleco. But i have had turtles for years. I feed them feeders on occasion and one of the feeders has been in my turtle Freddy's tank for about 2 years now. After about 3 months in the tank i could tell it wasn't a normal feeder but a cichlid. So he is about 4 inches now and i was thinking about moving him into his own tank. I have a standard 20 gallon & a standard 10 gallon. I was just wondering if either of those are large enough for him? He is in a standard 50 gallon currently with Freddy. Also any fish that go well with cichlids would help as well. He is aggressive and I've seen him eat a few smaller feeders while in the turtle tank. Any thoughts would be appreciated. Thanks in advance.