i have a 400 gallon system with about the same amount of light as you and submersable return and skimmer pumps. i had the same issue with a 1/3 horse chiller, so i got a 1hp coralife aqua-chill. i have it outside, and it works great. my electricity bill actually went down because it doesnt run very long at all. here in san antonio, we hit 100 or more daily for a couple months straight.
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Ace
tank build thread linked to the little red house.
new tank here: http://www.reefcentral.com/forums/showthread.php?s=&threadid=1276784
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