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- Aug 7, 2017
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What was the difference in your PAR readings with and without the glass when it is clean? I wanted to cover my tank to slow evaporation as well. I only had 1/4 inch plate when I was checking par readings, but I thought it was blocking my light a little more than 10% even when it was clean. I could crank up my lights, but it is summer and I am not sure I want to deal with the heat they put out.
I can’t remember but I can test it when I do a water change this weekend. I don’t think it was much of a difference, just a few percent.