Red bugs are one of the easiest to treat for. You just drop in some interceptor, turn off the skimmer, remove carbon and anything else that is treating the water, wait 24 hrs and turn it all back on. Problem solved. One dose always works, there are lots of articles that say you need to dose 4 times, I had them before, one dose, my buddy same thing, one dose. If you dont have SPS they will die. Keep in mind, there are now black bugs for LPS! yikes!