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75g is a minimal setup with no sump only filtering with live rock and a marineland polishing filter; no automation other than lighting so I gave fluctuations with parameters.I do not think it is sponge vs skimmer, they work on different principles and absorb different stuff.
Skimmer removes dissolved organic matter, sponge filters micro/nano plankton, including bacteria, but not DOM.
This particular sponge, you are considering is doing better in well established tanks, probably not in nano tanks.