clownfish's dorsal fin contracted

rfic

New member
i have 2 clown fish, one is a little bigger than another and i believe they get on well with each other

yesterday i suddenly notice the smaller one's dorsal fin looks very small or contracted while the bigger one's fin looks fine

the small one still eat well and i can't see any white dot on his body. but i'm really worry about it

any suggestion what's going on? thanks
 
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