i just got a 250w MH for my 28g bowfront. I have it set about 8" above the tank and there is a glass top on the tank. is the setup ok? will it produce alot of heat? would it be better to take the glass top off the tank? i have alot zoos and palys, a maroon clown, a scooter blenny, and a goby i cant remember what type it is though.