Ok...here's a strange one.
We did a 2 day black out in the tank due to a small algae problem that we were having. Today was day 2. We decided to turn the light on this evening to feed the fish, and noticed that our favorite acan was covered in goo. It was next to my blastomussa. What happened??? At first I thought the blasto was to blame, but there was also another acan on the opposite side of the blasto that was not affected. Our water parameters are perfect...so that wasn't it either. Would appreciate any insight as to what happened here.