Do you have snails in the tank? They can consume small fish pretty quickly.
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Thanks for the info, I have already added a spare power head, and ill look into the spot more
Sororities can happen but you have to REALLY do a LOT of research and be VERY careful when doing it.
Hard to tell from the pics provided, but it looks like it could be the start of a fungal infection. Fairly common occurrence, get yourself some Pimafix