Got my first two chocolates about three months agos. I had heard they were gentle and also heard they were quite mean. But these went into a 150 with other mostly peaceful fish: 4 Geo. surinamensis, 2 G. braziliensis, 2 Congo tetra (the last survivors of several old ones), pair of albino Angels, 3 giraffe cats, some diamond tetras + a few algae eating fish. The chocolates are about 4" at present. So far they totally ignore the other fish, but I may have two males as one shows a bit of agression towards the other, so far with no damage. May eventually have to move one to another tank but that's o.k.
Really cool fish though, sort of the oscar shape without the oscar attitude.
Really cool fish though, sort of the oscar shape without the oscar attitude.