I had missed a couple water changes the last few weeks, so I doubled the size of water changes last week and this week. I used to dose 5ml peroxide, but I cut that off about a month ago. I added carbon pads between my sump baffles a couple days ago just in case I got some unwanted's in the water (wife likes her air fresheners). Hopefully things will turn around. I'll bump up the feeding too. I use a mixture of mysis, reef roids, and coral frenzy once weekly and marine 1 flake twice daily for the three fish in there.