I have recently put in my 30 gallon tank a green torch coral with 6 heads and small hammer coral with 2 heads. They have lasted about 5 days and now seem to be dying. 2 heads gone on the green torch and both almost on the hammer. I have 30in corlife compact lighting that is putting about 4.5 watts per gallon, 65g protein skimmer, rio 800 powerhead for water movement and a 50g filter. My brain coral, xenia, polyps, and 3 fish seem to be doing fine. Any suggestions?