1 green other 2 brownish??

[Reptilegal]

Iv had my whites tree frogs for about a month now,
And when they first came they would go green,brown,green,brown and I could not give them names cos I had no idea who was who!!
But for the past 2 weeks iv successfully been able to name one, and that's because he/she stays green!!
But the other 2 stay brown mostly!!

DAYTIME TEMP 26 dec celciuss on hot side and 23 on cool side
NIGHTTIME TEMP: 23 deg celciuss
HUMIDITY: 70-80%

[Bolisnide]

White's range in color from deep chocolate brown to a turquoise... Everything sounds fine with your enclosure, they have plenty of places to climb to, and many things to climb on, up high?