I'm in the same boat u r. New frogs. Mine get kinda grey when I'm cleaning the glass. I noticed there's no covers on cage. If I leave mine uncovered they get grey too. It's been three weeks for me and I still have all sides covered until they get used to the new home. Now my problem is when and how to get covers off without freiking them out. I decided to uncover a side that just faces a plant. I dono, maybe cover for a few days, peek in and see if he's changed. I have 1 that's green all day brown at night. And 1 brown all the time. He was only greenish olive the 1st day home. Both were brown at the store.