first be carefull of not having a heater, true reefs run hot from the lights and the pumps, but at night the light are oof and so is your heat. I keep a heater in my reefs and keep it set at like 76 deg just to be safe . as far as the chiller yes they are rated for perfect condition just like filters. So always go 1 up. too small they work to hard and will burn out faster. just like an ac thats too small for you room.
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