acquired betta, have some questions!

[Butterfly]

Total cutie! ^_^

For my betta, I just switched him immediately and I had no problems. Since you can feed bettas a variety of food I never thought the adjustment to be an issue. Not sure with younger ones, though. You could definitely mix them for a few days, gradually adding more and more of the new food. Your choice though. I've never had any bad experiences with feeding my adult betta different foods without adjusting him, as it is said that bettas enjoy a variety. :)