Digi problem....any clues

[fighton03]

I have green, orange, blue tip and red digitata pieces in my tank. The green, blue tip and orange are doing great. The red has been doing great, but in the last few days developed what looks like brown algae coat on the body of the coral. The polyps don't extend where the coating is, but extend fine on the parts that are unaffected. Having trouble getting a response in the sps forum, any thoughts, revelations or suggestions in dealing with this issue?
Thanks

 

[sjj80]

Does it look like AEFW ( acro eating flatworms)???

I have AEFW right now and my coral had good polyp extension but when I picked it up to look at the backside it had a bunch of white bite marks on it. You might want to look all over your coral for bite marks, I wouldn't have even know my coral had AEFW if I hadn't luckily decided to examine the whole frag.