You may end up having a lot of heat issues if you fight evaporation. Evaporation is great in helping reduce heat. I have a 120 with a canopy that has an open back. I have 2 fans blowing from that back opening and I lose about 2-3 gallons a day. I'm not sure what kind of loss you're experiencing. My 2 cents and that's probably all its worth...he heee
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