Just an off the cuff though, could you not rate a skimmer based on ml/hour of "dense" skimmate (i know dense is a relative term) so at least all skimmers are on a level playing field. You could then calculate how many ml/hr you would need based on your bioload and needs. (no I don't know what that calculation would be, but it wouldn't take much other than experimenting with a baseline skimmer, and varying bio-loads to come up with an approximation)
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"what do you mean you need another tank??"
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