No quick fix. You have a nutrient problem which there is no quick fix for, its suppose to be prevented.
1) siphon out
2) siphon sand bed and sump of all detritus
3) big water change
4) run GFO
5) continue weekly until gone
Do not reduce feedings. If you have to sacrifice fish nutrition then you are overstocked or under maintained. Keep your fish fed.
29g Mixed Reef, 150w 14k Phoenix MH w/ Moonlights, Reef Octopus BH1000 HOB Skimmer, Ecotech Vortech MP10es, ReefKeeper Lite (Plus), PH Probe, Temp Probe, ATO, Carbon/GFO Reactor.