Trust me, you will only run into problems if you don't treat their water.

This is what I use, you only use a few drops each time and lasts a long time
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Second, you may want to consider removing the moss completely. Long strands like that can cause impaction. Even if you feed outside of the tank, these frogs have been known to snap at anything that slightly moves, including the moss. I would suggest completely cleaning out the enclosure to ensure there is no chemicals and replacing it with eco earth.

My adult female's set up.
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The product you're showing is for oral use I believe... You can use some, I'm sure it won't hurt, just read the instructions.

This is what I use for all of my frogs, I swear by the stuff.
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I would seriously consider making these changes, they can only help at this point.