Impur, i guarantee with the mods you have done so far your running at over 80w. You need to take off the top rows of NW's to keep the impeller at a good weight.
I boared out both sides of the elbo. If you do that and pull off the crap venturi that comes with it and make the duplicate venturi i have on there you will get over 30scfh easy. And the flow will be greater as well. You'll be amazed at the difference.
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There's no such thing as a normal reef, there's just reef
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