I have a 300 gallon with 55 gallon sump, every night before feeding I unplug sump before feeding. Last night when I went to plug it back in, the sump pump was gasping air, and water level was extremely low. Taking a closer look, it was overflowing the 300! No idea how that can happen, it's a drilled tank with overflows in each corner...any help as to what I can do? Thanks!
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