Change your pump. The Mag12 is notorious for its heat production. My friend's Mag12 will raise a 50g barrel of water change water to over 90F overnight.
For that size tank, a Mag7 or Mag9 (or equivalent pump) would be plenty.
If you want to test it out, fill a large container or tank with water, add some tubing onto the outlet to keep the water inside the container, then plug it in. Check the temp before & after to see how much it raises the temp. If it shoots up the temp, this will become a major problem in the summer time.
Just a word of warning.
Anthony
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If you see it, can take care of it, better get it or put it on hold. Otherwise, it'll be gone & you'll regret it!
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