I have a baby red ear slider, approx. 2 and 1/2 months old. there are three others. this one has been staying toward the bottom and when I watch him as I feed the rest he will make an effort to go to the top , but won't eat. Tonight I put him in a seperate tank with much less water. I noticed he is taking large deep breaths and exhaling. I think it might be be respitory, but what do I do ???