I've had the sebae in my tank for over a year, I spot feed it every week. when i first got him it would open up to 4" last few weeks he wont open and has begun wandering around. I have done frequent water changes thinking this might be the problem and switched from instant ocean to instant ocean crystals (1.23 gravity). My clown fish is depressed casue it wont open any more. I have a 20gallon with protien skimmer, Current Orbit lighting system, Ehiem canister filter which I clean monthly. Any help or idea would be apreciated.