At what age would a Dempsey reach full size.And what are there adult size,I have heard between 6-12in which is the most common adult male size.12inches i think of an oscar ,do they get that big.
OK..... a few things from what ya'll have posted. 1st: As I understand it you should only keep mated dempseys in tanks by themselves as they get very agressive when laying eggs and handling fry.
2nd: I am surprised you are able to keep a Jag in a 150 with all of those fish. From what I have heard/read Jags get extremely terrotorial and are 2nd only to Doviis for their ability to kill everything else in a tank.
Just some observations. Great fish btw.