morrish idols

so someone in my tank has been notorious for eating the streamer off the top fin of my morish idol (i suspect the clowns) now i see more damage to the fin and i white circle not spec is it agression or rot Im concerned either way. but want to get an opinion on this. I know my clowns are mean and...

Okay, so before anyone jumps down my throat about the low success rate of these beautiful fish in aquaria, please read. I have always had an interest in having a small school (3) of Moorish Idols. I am currently designing a 240gal tank build and would like take any steps I can to be successful...