Hello and welcome to the forums! You came to the right place to ask question! I have no idea where is everybody and why nobody replied yet hello people??? I've never had red eyes, but will try to answer to the best of my abilities.

automatic fogger is aways better for people like me who like to make sure everything is perfect at any given moment. So i always use and advise everybody to get a zoomed hydrotherm, plug it into your fogger and heating device and not to worry about humidity or temps ever again.
Im sure the frogs would appreciate real pants and naturalistic vivarium and you, coming from reef tanks, would really enjoy making one for them. Be careful though it is very addicting
I would be careful of mycobacterium marinum if you plan on using old fish tank.

Check a care sheet here, it is pretty good!