They are not the strongest of swimmers, so no strong currents. I am not sure they would e able to digest the mealworms, and most illnesses that frogs tend to get, you won't know until it is too late... The problem with these guys is that they are very stoic in the face of illness and injury, because if you show that you are weak in the wild, you get eaten. I would just try to keep an eye out for those three, as they are the most common and the easiest to spot, and keep meds on hand.
I cannot say enough how good melafix is for fish other than bettas, I have a 20 gallon that I am treating right now, it is a community, and was also home to a five girl sorority... Well all give girls just went belly up for seemingly no reason at all last night, and now some of the other inhabitants are doing the same... My specs are great, and I do frequent water changes, but they are still just... Rolling over on me left and right. So I am dosing the tank with melafix, and hoping that works... :/ I have terrible luck with sororities... I've had three in the last year, all of which have ended in total loss of all females due to some illness... *sigh* I give up on sororities, seriously...