Look up bleach dosing. I researched it and found a thread on here with a guy who did it to get rid of Dinos and I believe he did a maintenance dose once a month after the fact. I decided to try it after nothing worked well. I have about 140 gallons total water and I would dose 3.5~ML twice a day. Took about 1-2 weeks before it all was gone. I would stir as much up before the nighttime dose to make sure the bleach would hit it in suspension. Seemed to work. I know the guy on the thread dosed a bit more than me but I didn’t want to start out that high. Then after it was gone I cleaned my skimmer out good. Hasn’t come back. But I only got it because my nutrients bottomed out. Make sure that’s not the case for you. Oh and I had no losses due to the bleach , corals, fish, cuc all fine.