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So would anyone know why it isn't returning water or have similar problems with a system like this? And also could a regular filter built for the size of my tank work fine or do I need a sort of sump?
Sorry my phone keeps sending my reply early. What I was going to say is my 36g runs fine with a fluval 306 canister (70g) and fluval HOB (50g) runs great. I have 30-40 pounds of LR in the tank and 2 500gph power heads.