Hi,
I have a couple pieces of coral rock in the tank which have developed a number of green bubble like attachments. These are hard to the touch and I would almost describe these as hard air bubbles.
Any Ideas? I notcied 2 a few weeks ago and I now have quite a few on that rock and a couple have appeared on the rock next to it.
I have tried to get photos, but can not get a clear shot at them.