That is a bacteria bloom. Where is the slime building up? Skip a day or two of doses, then resume, but back off a little on your dose. What is your water volume and what how much are you dosing?
During the bloom, The bacteria can consume the oxygen in the water, and of course the slime can smother your corals. You need to stay on top of keeping the slime removed from your tank. Make sure your skimmer is working at peak performance, I would set the skimmer to make a "wet" skim.