It is good to hear that your frogs are healing I have my fingers crossed. I think you could be right about the stress I might find it good news to finally sort their waterfall so it works properly but to them all the changes are just stressful! They are now settled back in their normal surroundings so I hope the stress levels will be coming down. I also think that it is quite probable that the humidity hasnt been all it should be I often find new tanks seem to eat the moisture and I hadnt compensated for this so it is quite probable the levels have been fluctuating I will keep a closer watch on it and if necessary up the timings for the fogger!
Regarding the nose rub, I dont have any experience of this but I think the nose rub is fairley minor. I have now spoken to my vet who indicated from my discription that antibiotic treatment could be benificial, although as she hasnt seen the frog she isnt allowed to tell me to use it! So I will keep a close eye on him, I dont want to move him to a hospital tank as that would involve more stress! I do hope yours will soon be fully well regards Jay