The toby should be the only fish in there, and why not just get a mantis! Great for a 28 gallon, completely reef safe, except for shrimp snails and all types of crabs o course, and I wouldnt reccomend fish, but mantis have lots of personality! Mine is like me, he lazes around all day, gets up, looks around, goes back to bedm then late in teh day Poof Hes Awake!