I've had this particular acan about 2-3 years and have never had a problem with it. I did however just move my 38 gallon tank and all inhabitants into this new 40 breeder tank I have setup now. Everything else is doing very well. I first noticed this spot on my acan a few days ago and it appears to be getting bigger each day. I was thinking maybe it was brown jelly disease because I did see a little bit of brownish tissue where the coral tissue is missing. It may be hard to tell in the photo, but its the best I could really get of it without unmounting it from the rock it is on. I know if it is brown jelly I will need to cut the healthy coral away from the bad spot. But could it maybe be something else? I really don't want to loose this acan! Thanks for any help in advance.
