Without picture it is VERY hard to diagnose your problem.
Soundls like a parasite, this would explain the mangled look. It is posibly scratching itself on the rock.
The fireshrimp is still a cleaner shrimp, it my be trying to help, but never seen smaller fish allow them to get too close.
May be too late, but if it is a parasite, you may be able to use a freshwater dip on it.
Ken - BWA
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