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Yes use a circulation pump. Air stones cause water to evap quicker thus raising ppm

Well the general rule is 3.41 btu per watt of light i run 4 btu per watt. I use a gree minisplit system with automatic heat and air so i dont have to switch back and forth due to ambient conditions...believe me i went thru all the inexpensive ways to grow this stuff and u have to invest to do it...