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- Jan 9, 2020
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Ok so I am doing a water check on my Biocube (filling it up with water then draining it just to make sure it holds water) and just have a question. So when I fill my tank up to the top do I independently add water to the sump too? Also should I even add water to the sump for a water check? Sorry if these are dumb questions but I just want to make sure.

