OK, so in my 60g I have four fish, a yellow tang,a clown and unfortunately two damselsi can't catch. Everyone gets along and the clown never goes more than 3" away from his nem. He had a female paired w him but she jumped out a month ago. So i'm looking at adding something. The tank is 23"tall x4ft x 13 wide. Any suggestions on fish that are reef safe. I do like wrasses. Should add I got about 90lbs lrand the tank had been up for about 1 1/2yrs
Also I don't have a top on the tank

WhenI take this tank down for something bigger, damsels will be gone....