I wouldn't medicate him; doesn't look seem like he needs it. On a betta forum, there were quite a few people who were having problems with dosing Melafix to their bettas.
I would keep him in there if he seems to like their company. I also feed Hikari Betta Bio-Gold. Most of my bettas have loved it and did well on it. Like CCT stated, bettas are top dwellers. Feed him meaty foods and not too much vegetable-based foods.
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Eheim Pimpette #230
Google is the remedy for stupidity.
It's not the size of the tank, but how you use it.
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