The pale parts of his tail in the picture have taken a blue sheen to them.
I came home today and noticed how active and healthy he looked. I'm so happy. I'm terrified to take him into a smaller tank, though, even if it is only temporary. The container I found for him at work was much too small (only half a gallon!). I was certain we had bigger containers, but I guess they sold out.
I think I may keep him in his regular tank, but change the water often. I've been considering up to twice a day. Is there such thing as too many water changes?