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Could be a case of fin rot. Was it all the sudden one day just gone or did it slowly deteriorate?
What else is in the tank?
WHat are your water stats in ammonia, nitrate, nitrite?
Did you cycle the tank?
If i remeber right, SAE get very vicious! You tank appears to be over stocked. I would get rid of the SAE's and the otto and the Tiger Plec.