My tank has gained peace now that I have removed my bully yellow tang, so I want to add some more fish, but keep the peace. I have a 280 gallon. My current fish are hippo tang, bicolor angel, copperband, royal gramma, lemon chromis, pair of maroon clowns, four wheel goby. A little worried about the gramma but he is 8 years old and full grown so thinking a smaller captive bred might work out. Wondering how nasty this fish is?