I can only speak to having one and in a relatively peaceful tank. But mine hangs out all day other than darting under a rock if it gets spooked. But usually returns within a couple minutes. Has gotten less skiddish over time.Hey guys , I'm not new to the saltwater world but it's been a min . I have a question on one fish in particular, I have added 2 firefish to my tank one has gone into hiding and one will appear . Is this normal for them to hide