fuzzy algae

Sorry for the crappy photos, hard to get a good one. Tank is 1 1/2 years old. Mixed reef 40 gallon cube. 10 gallon water change EVERY week. I just noticed this weird like gray almost mold like fuzz growing in small splotches on my rocks. Not sure what it is, would appreciate advise please

Hi! I have an IM lagoon 25 that has been running for about 2 years now. I have this weird fuzzy growth on the rock (for about 6 months, doesn't go away on its own). It only grows in the light so its photosynthetic. It has a brownish tinge to it but also can be closer to white. It doesn't grow...

Hey everyone, I noticed this weird white fuzzy looking algae stuff that almost resembles cotton. I've done some searching and it seems like no one can agree on what this is. Algae? Bacteria? Fungus? I've tried scrubbing it off with a toothbrush and it does come off but not entirely. I'd like to...