to skim or not to skim

[Snaz]

Originally Posted by subman

maybe on a small (pico) tank but removing two cups a month of skimmate sure doesn't change my sg. I top off with pure clean ro water no mix. when I change water I check sg and make adjustments due salt creep ect. but it hasn't changed in 4 years.

Yes I should have mentioned my tank is 12g. I can see where a large tank could benefit from a skimmer.