I may be off here, but a dryier skim is more of the nasty stuff, while it allows more benefical stuff to pass by. One thing for sure is that with a drier skim you empty the cup less and a wetter skim your doing it much more frequently.
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75G, 100 lbs LR, Inwatter Stingray LED's, 25 Gallon Sump, 24wt UV, hermits, Snails, pep, fire & cleaner shrimps, Blue Throat Trigger, Perc Clowns , Yellow Tang, Coral Beauty, Blue Regal tang, RBTA, Coral Banded Shrimp, Checkerboard Wrasse, Many Corals, Royal Tux Urchin
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