yeah seems about normal. Of course it will also slightly depend on the temp of the room as well as the water but...
I go through 4-5 GPD easily. Wish I had more room than a 20 Gal ATO container under my sump that I can only fill to 15 Gal. Seems like I am always filling that thing up but with a large open top tank and sump it's pretty normal to have that much volume driven off.
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130 Gal Community Planted Tank and a 250Gal Peninsula FOWLR
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