So I am planning on switching over my reef tank today to a new one that has a sump. This is my first setup that has a sump and everything. It is a fluval studio 600 that was converted to a reef tank. I want to use 50 percent of the old water in it. So I started with the fresh saltwater. I filled it up about halfway and the water started going into the sump. Hadn't even reached the drain pipe yet. Then I took out about five gallons and it stopped. Doesn't make any sense to me. Any idea what's going on?
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