So I have been watching many videos about setting up a tank. I have a 230 gallon that is reef ready. My question is that the 2 overflows have a 1.5 inch and a 2 inch hole. Which one is the drain, and which one is the return?
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So I have been watching many videos about setting up a tank. I have a 230 gallon that is reef ready. My question is that the 2 overflows have a 1.5 inch and a 2 inch hole. Which one is the drain, and which one is the return?
1.5” would be the return and the 2” the drain.