I did read your post about flukes and am trying to see where i can find some fluke medication. Not easy given my options are limited in terms on shops etc.
He is on his own, in his own tank. When he was put into the other tank, he was in a floating compartment thingy.
Just quickly wanted to add two things:
1) If your betta does have flukes then putting him into another tank with another fish can cause that healthy fish to become infested with flukes also... so, definitely keep him away from other fish. You'll need to keep an eye on the fish in your other tank that you floated your sick fish in. First signs of any flicking/scraping etc, start treating them with the same fluke meds.
2) Even though your sick betta was in a floating box - he would still have been able to see the other betta swimnming around in the tank, causing stress. Even healthy male bettas should be kept separate from each other and if tanks are positioned side by side it's always a good idea to put something between the two tanks (like a piece of cardboard/paper or printed background poster) so that they don't have to eyeball each other and get annoyed LOL
Hope you manage to get hold of some meds asap. There are some online shops that deliver next day if your LFS doesn't sell anything appropriate.
Good luck - Athena