You could raise the level of the return by adding a couple of elbows after the bulkhead. I concur with Hawks suggestion for reducing the flow to the tank. Lowering the standpipe will likely not solve anything as the flow is simply exceding its capacity. You would have to have a larger standpipe if you want to open up the flow more.
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I retired and got a fixed income but it's broke.
Ed
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50 gallon FOWLR, 10 gallon sump.
130 gallon reef, 20 gallon sump, 10 gallon refugium.
10 gallon quarantine.
60 gallon winter tank for pond fish.
300 gallon pond with waterfall.
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