I have a 55gallon tank, with a 3" undulated trigger, a 4 1/2 " regtangulus trigger and several damsels. All have been coexisting well for nearly a year. 4 days ago, while cleaning tank, rectanguls got spooked and tried to jump out of tank. Unfortunately he missed and hit the wall, then fell back in water. I can see no visible injury to him, but since then he is hiding in cave. I haven't seen him eat, so I am very concerned. Normally, he is very active and the most dominant in the tank. Any advice? I am a vet tech and have meds available to me if needed, but so far have been unable to find a fish vet in mich. to give me dosages or advice.