Since he only likes the 1/2 gallon...

[AngelicScars]

I have gravel and a fake grassy plant in there right now. Anything else and it would be over crowded.
So, just a full change twice a week with no 50% changes in between?

[dramaqueen]

Thats what I'd do.

[Vikki81207]

yeah that sounds good

[AngelicScars]

Alrighty, thanks for the help!

[ifish]

maybe in a week or 2 hell be ready to go back to his normal tank

[AngelicScars]

At this point, I would sort of doubt it. I've been trying to get him back in his tank for awhile now (tried 3 times) and all times he hated it.
He has perked up and acted happiest in the 1/2 gallon. I've noticed that some Betta just feel more secure in smaller areas, so maybe this is what he wanted/needed.