I had my pleco for almost two years now. I recently purchased to jack dempsy and this morning when I turned on the tank light I noticed that my pleco was upside down but still breathing. I taped him and quickly moved to the side of the tank but in less then a minute he floats to the surface again. I noticed that his body has beedn attack, he has red spots as if they have been trying to bite him. he is not in good shape. So I transferred him into another tank where there are only guppys. I know that the Jack dempsy are the cause of this cause a few days ago I saw them attacking the Pleco but never thought they would do this much to him. Please help. can anyone tell me what to do to help him recover.