My temp swings about 3-3.5 degrees each day on a 33 with the coralife PC 192W fixture. Havn't tried to reduce this but it doesn't seem to be a problem with any tanklife (at least that I know of).
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-Mike (Tank Info / Links / Pics shown below)
120G Reef with 2x250W MH lighting
My old 33G Reef with 192W PC lighting
Live Rock - These tanks have some purchased liverock, but mostly home made live rock
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