mgriffeth;990220 wrote: Thanks! I did see a decrease in cyno after a 2nd dose (with a duration of 3-4 days following first dose- chemiclean was what I used) but my corals seem less happy (hammer frag recessing, with a third of it dying off completely, zoanthids hardly ever fully opened anymore, frog spawn noticeably recessed, pipe organ only opening 5-7% of its polyps, and pulsing xenia (newest addition- in tank 5 days) shriveled and not pulsing. Inversely, my duncan, chalice, green stars, and kenyas seem OK but not thriving. I have a cynarina that hasn't shown any signs of decline as well. I'm using a feeding pipette to blow off the corals and a toothbrush to remove the bloom on my rock. I've also siphoned sand twice and performed 3 water changes since I noticed the bloom (it came on quick . . . like, within 24 hrs.). I'm also dosing iodine once a week and have gave the hammer an iodine dip after removing the dead portions. I can live with cyno if corals appear happy but right now, my tank has the blues, it seems . . .