I believe the OP is talking long term. A growout tank is meant to be a temporary home for fish. There are many fish that can be kept together temporarily as juveniles. The fish mentioned by Cacichlids will also be hard to keep together long term due to possible breeding behavior and size of the largest fish. It's just so much easier and healthier to stock a tank with appropriate sized fish at correct numbers.
Festae and JAG will deff get too big but you can keep the green terror and jack dempsey, green terrors are not At all aggressive there as peacful as an Oscar
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Not true. It really depends on the fishes attitude and tolerance of other cichlids. I've kept 4 gts and a jd pair in a 55 grow out with no problems. I only had 2x ac 70s witch would be a little over 2x overturned.
