It wouldn't need to be dialed back anywhere near 50% though. I use the Fluval SP4 on my 93 gallon. After head height loss and loss due to plumbing , 90 degree elbows etc , he is nowhere near 1800gph anymore. If the overflow can handle 1100gph then he's probably pretty close and just needs to dial the pump back a little bit with a ball valve.
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