Recently purchased an established tank and reset it back up in my home. There were a few pieces of live rock with some corals on them I set up a small quarantine tank(mini hospital) for the few rocks with corals on it. I have noticed that the"leather" has developed small polyps, is this normal? Can anyone explain to me what this is, please. Any help would be great. I am fairly new to this hobby and am enjoying learning more.My large tank has several corals including Kenya trees, toad stool polyps and and zoas. Love the great coloration.

