Without a microscope I’m certain I have ostreopsis. It nuked my tank early on. I’m still battling it without much success. I’m moving my uv to the display in a few days, having it in sump hasn’t been successful. My question is, what is this algae I’m looking at? It’s slimy and fluffy, all over my rocks. I can scrub and blast it but it comes back within 2~ days.





