I'll have to see if I can get my hands on a 6qt, but if the tub I already have is suitable, I'll most likely end up using that one.

He refused his food even before the infrared so I doubt it's the the cause of him not eating, he might be sensitive to the light and that is why his activity has increased so much, combined with the hunger he's feeling, but I think I'll switch it out to a CHE, just in case.

Thanks again, I will post an update in Solidus' thread when I know how best to proceed after I've given him one more week, but as of right now, I'll probably have to re-house him in a tub instead of a tank, and honestly, if the tub works, he can remain in one even past 200g as far as I'm concerned, if he's healthy and begins to eat.