I need a chiller and just can't afford it right now. I was wondering...if corals need at least four hours of light per day, does it matter how they receive those 4 hours? Can they get an hour of light at 4 different intervals? Does it have to be a certain light? ie. Can it be 4 intervals of actinic? Its so difficult keeping my lights on and temp down. I'm placing frozen liter bottles of water in the sump but I've already experienced RTN and I just know its from the heat...One coral lost all its orange color and is now cream colored (at least its not down to the skeleton) another appears down to the skeleton but still has polyp expansion...thus the lighting question, any thoughts, ideas?