willbratz
Aquarium Advice FINatic
An anyone tell me what this is? It appears to be some sort if algae, maybe? I don't believe it's Cyano as it can't be "scrubbed" off the rock. It's only on two of my rock which have zoanthids growing on them. If it's bad how can I safely remove it. I do have a 55 with only water in it, so if need be I could black them out for a week.
