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If i could re-plan my whole system i would go bare bottom with bottom drains in my tank. Just like in a true koi pond system. So basically my system would not have overflows. There would be two tanks on the same level one as a filter and one a display. The water would exit the display through the bottom drains, go through the filter tank and be pumped back into the display. Its not feasible for very large tanks, but for smaller tanks it can work.
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