I think the best way is by food usage, more food the heavier the bioload, but this is complicated by natural occurring food in the tank, like algae that your tangs might eat and so on.
In the end though the only way to tell if your skimmer is big enough is to see if it is removing what it is supposed to by water quality tests. That's why traditionally we have always doubled the size of skimmer that we thought we needed.
Steve
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 *everything said above is just my opinion, and may or may not reflect the views of this BBS, its Operators, and its Members. If cornered on any “opinion” I post I will totally deny having ever said this in a Court of Law…Unless I am the right one*
Some strive to be perfect.... I just strive.
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