I have been using for maybe two months now? I can't say exactly when I started seeing a difference to be honest. And no, it has not made my skimmer go crazy. I usually only have to empty once a week. I don't have a real heavy bioload right now though either.How long did it take dosing the Koralcolor for results? Also does it add to nutrients in your system? I am thinking about starting to dose it? And lastly, lol, does it make your skimmer go cray?