i actually think the opposite, lol. i would think that with breeding pairs you would have to lower the stocklist because they would need more space because of their more aggressive nature during breeding, i keep all male tanks and usually dont have many problems, the one time i did have aggression issues was when my JD was starting fights because he had paired with a female GT i happened to have in the tank at the time, one female and it threw the whole tank out of balance, so i think you would do well to have a male only tank like i and many other members on here keep, we have found that without a female to fight over the males actually tend to be not as aggressive as they would be if they had something to fight over
but yeah i think you will have to watch them as they mature though since there are fish of varying aggression levels, you will just have to watch and make sure that the milder ones aren't being picked on, and if you like the blue colors then i would definitely add in a carpintis rather than a cyano, i particularly like the vontehillo variant, pictures really do not do these guys justice, they look all greenish in their pics but really they are a gorgeous dark blue color that IMO can't be beat, the escondidos are nice too but IME the vontehillos get a nicer darker color, and they color up alot sooner than Escons do
but yeah i think you will have to watch them as they mature though since there are fish of varying aggression levels, you will just have to watch and make sure that the milder ones aren't being picked on, and if you like the blue colors then i would definitely add in a carpintis rather than a cyano, i particularly like the vontehillo variant, pictures really do not do these guys justice, they look all greenish in their pics but really they are a gorgeous dark blue color that IMO can't be beat, the escondidos are nice too but IME the vontehillos get a nicer darker color, and they color up alot sooner than Escons do

