So just treated my tank a couple weeks ago for like a green cyano that was forming a layer on my sand bed. Treated with Chemiclean. Did a large water change after and now this a week later. what the heck!!!
Additional info: 150gal mixed reef. Nitrates and Phosphates always come back 0, if not VERY close. I would say heavily stocked. Fish and coral all happy and growing. Try to feed heavy 2 x day mix of a bunch a dif frozen foods and phyto. Large uv sterilizer 24/7.
Chemiclean often runs the risk of developing dinos because it kills a good amount of beneficial bacteria. Which then gives dinos the chance to take hold