they swim side by side sometimes, its weird. i got my O in october, he was maybe 2.5inches or 3, he's probably close to 6 now, i love how his fins have grown so big, they keep growing, its wild to watch how he flares it up when i come to the tank. im hoping to move everyone into a 90 gallon over the summer, especially if i leave the convict stay in there, it is interesting to watch him eat all the others i put in there and that one is like his lil buddy. ive even given him more convict fry after he spared that one and he's eaten all of them. he can still fit this one in his mouth im sure, he just doesnt seem interested. they say convicts will breed with anything, is it possible? even if its not i bet they try so it should be interesting.