Okay, it has been two days. I put the second treatment in the tank. I just noticed he was pooping something white and cottony looking, it was about 3/4 of an inch. He is still not eating anything, but is this a good sign?
White feces is a sign of internal parasites. Can you get a picture next time he passes a bowl movement? The only good sign is when he eats.
How many water changes have you done? I assume your aren't taking my advice in doing daily water changes. Clean water is key and medication needs to be replaced every time water is taken out. Have you increased the temperature on both your tanks? What else do you have in your main tank? I see a killifish by the looks, don't think they will stand the high temperatures very well.