I would personally get the rs100 if you aren't planning on upgrading in the near future. I had trouble getting a good foam head on the rs100 in my 40 but it would probably be perfect for a 90. Also, the sedra3500 should be quieter than a larger pump I would assume. Anyways, I like the 100 and bet you would too. Having too large a skimmer is easily as frustrating as having too small a skimmer.
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