Re: I know this is a big topic on here Iíve been going over it for the last few dats
Open your viv and let it dry out for a day - this will set-back the mold. Then slowly re-moisten the viv making sure not to leave it wet (which will encourage the mold to return). Hopefully if you keep things drier the mold will stay better in check. This is not a guarantee, however.
Ideally you should have waited longer after setup to get your frogs - for exactly this reason. New setups take time to stabilize and mold problems are a pretty frequent issue after a new setup (especially until you get your watering/moisture level right).