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I have the older version of the Classic 400 and it is a beast!!! Protein Skimmers It is running on my 300 with 125 sump and frag system.
I would go with a Vertex Alpha 250 cone or ATB 1050a.
Aqua Euro, their page is in the hyperlink.
Is this enough skimmer with a heavy bio load in the 220 this will be a LPS tank no SPS?