Been dealing with this for about 3 months. It built up to a dinoflagellates issue that I beat. I'll send a pic of that but this is what I'm left with. The pic is not the normal lighting I too w/ whites up bright.
So I raised my nos and phos to get rid of it. Also dosed the Bacter7 still dosing every other day. Currect testing
No3-5
Po4-.02-.1
Dkh-7.2
Ph-8.2
Cal-465
Mag-1300
Temp-78
Ppm-1.024
Like I said I brought them up kept my skimmer off during the diarieha outbreak lol. I just plugged it in bc my ph4 went to 1. Like I said it was a subtle thing that happened. I set this thing up in October then I upgraded lighting. Now I'm doing 1/4 of the led lights @200 par for 8 hrs.
Answering your a question a Turkey baser won't blast it off, or toothbrush can't get it off, only scrapping it with something it will come off.I used hydrogen peroxide on 1 liverick to test. And came back slowly came back. The came white fuzz then the diarrhea dinoflagellates