they might be ok.... but if the cons are breeding all the time they might beat the sh*t out of the aro and maybe even kill him just to protect the fry. so its a risk but it might work. how big do you mean by "full grown" about 6" ???
like i said its a risk that you might have to take... but a 125-gallon might be big enough for the aro and the cons to stay away from each other. do you have any decorations/plants in the tank?? if you do those will help.
well its worth a try since its a big tank (you will have to upgrade later for the aro though)... i see that you decided to sell the cons in the buy/sell forum... that is probably the best choice.
i have an extra 55 gallon they were in before. I was just wondering if it was a good decision to put them in with the aro. I plan on giving the silver to a friend and getting a Jar
a 55 is a bad idea because the aro is MUCH more likely to get picked on is a smaller tank like that. so i would get rid of the convicts ASAP.... you should give them to a LFS if you can't get rid of them in time. also a Jardini needs a bigger tank than a 125 also.