i have a 180g all male tank with lots of lace rock work same time some open areas for fish to swim and i think this the luxury of having a big tank but still you will need to have the right mix in there. peacocks haps do well together. stay away from hybrids even thou i have some because they are mean. just make sure you change the decorations every time you add new fish to the tank keep lights off for an hour or i would just keep on adding fish till its full then add decorations later on so you know nobody will be fighting over their territory. good luck