i have a 90 gallon tank but i cant get the temp down to 78 i think its the lighting i have 2 250 w metal halides and 2 110 w vho flourescents but i dont tihnk they heat it i tihnk it might be the halides but they sit a good 8 inches above the tank wasnt watchin the tank for a few days while my friend watched the tank and when i came back the temp was 90 is ti possible for the halides to heat it that much that quick? and if so any help anyone can give me would be good thanks