I have a chiller but voted for the controller. I think in an sps tank both are actually "necessary" but the awesome flow that the (Tunze) controller creates with the pulsing action makes a world of difference. The chiller will keep my stuff alive and looking good (with no rtn/stn) through the summer heat. Now I have these items I wouldn't give them up any more than I would stop using R/O filtered water. Next on the equipment list is a calcium reactor.
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Greg
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