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hlle? Always trying to learn and what better source.
Two different things.
HLLE: https://www.reef2reef.com/threads/hlle-head-lateral-line-erosion.259916/
“Hole in the Head” is caused by diplomonads (internal flagellate) which start out in the GI but oftentimes migrate to other parts of the body. In this case, the sensory pores where it tries to bore out (creating lesions). This is exactly what Hexamita does in FW Cichlids. I have scoped very similar looking diplomonads in marine fish.