helpid

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! New to the reef world. My dad and I currently habe a reef tank with some clownfish, cardinals, gobies, shrimp, crab, anemone, corals, snails and hermit crabs. Recently we’ve found some growth in the the back of the aquarium and found some today on a rock near the front. It looks like...