Tank ben runnin 1 yer. Furst 2 fish boute pajama cardinal and dis blue devel damsel. Didn’t now better. Since then, Dory, tangs, goby’s, clowns,domino, foxface, another damsel, bangai cardinals, royal gamma, could go on, but, the damsel and pj cardinal, 1st two fish, are only ones alive. Guess you know the question? What is a tank mate for this devil? Water good. Only thing I can figure out that happens to my fish.