I did a water change yesterday and used a razor on the back glass where it was the worst it almost looked like tree fluff with a tiny black root base at the end. it doesn't seem to be bothering my corals which is a good thing. this popped up about a week or so ago and was at it's worse just the other day. aprox how long did it take to go away for you?I guess it is some kind of Bacterial stuff, mine just disappeared after some time. I'm currently cycling a new tank , and have this fuzz since day 2
did you ever find out??I seem to struggle with this same issue every time I start a new tank. It hasn't ever gotten as wide spread as yours appears to be, but instead pops up in small patches on the rocks in 2 or 3 areas. I have yet to find a definitive ID or solution to it and it always seems to go away on it's own as quickly as it appeared. It also seems to appear anywhere from 3 to 6 months after setting up the tank, usually soon after the initial cycle.
3 months ago I bought and setup a new all-in-one nano tank (JBJ Nano-Cube 29g). I set it up and started the cycle as I always do, using Bio-spira, live sand and rock and a clown fish that I've had for years and always use for this. And sure enough, two days ago the fuzzy cotton-like "fungus" has appeared. To me, it strongly appears like a fungus. This time, I'm just going to let it run it's course and not drive myself nuts trying to intervene. I've experienced this 4 other times and it always goes away on it's own.
I am a veterinarian and we use a lab to send samples to for ID. Today I scraped off 4 different samples and put them in various culture dishes and one in a sterile non-cultured test tube. I will send it off today for identification and sensitivity test. As soon as I have the results I will post them here. It will be nice to have an answer regardless!
Happy reefing everyone!