I got rid of my cyano easily with one dosing of chemiclean but right after an explosion of Dino came I’ve turned lighting down as well as started feeding more to increase nitrates. I don’t think a UV sterilizer will work since I don’t think my Dino goes into the water Column. But I have noticed some Dino floating at the top of the tank and I’ve read that dead Dino floats so maybe the nitrates went up.