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Hello and welcome Jenn,
Depending on the size of tank and filtration if used, you may or may not need to cycle and this can be done with the Betta along with dedications to water changes.

When you make water changes make sure the water temp between the new and old water is within a couple of degrees so not to temp shock him and use dechloranator with any new water added to the fish tank.

If he is in a small 2-3g unfiltered tank-I recommend twice weekly water changes 1-100% and 1-50%
In 1g or less daily to every-other day water changes

The only chemical additive IMO that you need is a dechlorinator if you are on city water supply

A good varied diet, removing any uneaten food after feeding and don't over feed

Water temp kept in the 78-80F you have a heater?

To answer your questions- yes, it is good that he is swimming around and it is normal for him to check things out in the tank, fresh clean dechlorinated water is the best thing for torn fins, depending on how long the fish was at the pet shop most are fairly healthy and some are not...
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