I have a vertex in. 180 on my 120 with a 40 gal sump and it does pretty good but I have 1/2 the water u have and a small bioload
I would think this skimmer is too small for your setup
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250G DD LED SPS R.I.P.
180G LED SPS
80"x36". 300G custom build
Owner of Mountain Ridge Heating and Gas
Class A gas fitter, HVAC
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