Almost looks fluorescent - could it be fight damage or something more sinister. He is eating and seems ok doing what he normally does - no change in behaviour. Hard to get a closer photo.
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Got some Cardinal fish, Midas Blenny, Yellow Tang and some electric blue danios. All been together about 8 months. Danios are small. Not seen anything bothering it but, of course, don’t watch 24/7.What other fish do you keep?
Got some Cardinal fish, Midas Blenny, Yellow Tang and some electric blue danios. All been together about 8 months. Danios are small. Not seen anything bothering it but, of course, don’t watch 24/7.

