Hello,
Your boy looks really good overall. How long has it been since he has eaten just since he came
out of brumation in February? Have you tried changing up his diet some? Maybe try using some
bee pollen to help boost his immune system.
If he is losing weight you might want to wait to move him to another tank until you figure out what
could be going on with him.
Since you are using a temp gun, your temperatures should be spot on. What are the ambient
temperatures in the tank? If the tank is sitting directly in the sun then the ambient temperatures
could be getting too high which can affect his appetite & behavior.
Let us know how he is doing.
Tracie