Generally you should always quarantine new additions before adding them - I would keep a very close eye on both frogs for the next month or two, you never know what diseases the new frog came in contact with at the breeding facility (or going forward, pet shop etc).
These frogs shed skin frequently - that is normal for them. If it is shedding in taters, that is not and can indicate a sign of stress / illness. They breathe oxygen from the top of the tank, not through the water like fish, so surfacing is normal but frantic surfacing/swimming constantly is another stress indicator.

A lot of the questions in the frog health sheet do not apply to aquatic species (humidity levels, calcium, handling etc) so don't fret if you weren't sure how to answer them.

You need a better quality tap water conditioner than the grow a frog crystals (I would honestly toss out everything grow a frog gave you!).

You can find tap water conditioners at your local pet store in the fish care aisle, along with Reptomin or HBH frog/tadpole bites which can be fed to your frog and much cheaper than ordering from Burley at XenExp.