I'm very curious about this also. I have some of the exact same stuff showing up in my rock. Don't think it's cyano
as I've also had that problem in the past. This stuff is hard like coraline and was hoping that's what it is.
Mine is growing mainly on some smaller pieces of liverock rubble that I added to my 50 gallon FOWLR
. I got a 45 lb order from liveaquaria.com about 3 weeks ago for my new 90 gallon. These pieces were too small for the 90 and since it was just a small amount of rubble, I put it in my 50 gallon. These small pieces seem to be the only place it's growing. Definetly not spreading like my cyano
did, but that's what I thought when I first saw it. Funny enough, It's not growing at all on the large pieces that are cycling the 90 gallon. Not running the lights much in there though.