I have got two and both are brown-green, I would say olive. During the day they hide on the ground, behind the cascad or other hides...they are always down. And at night they go out. I think that there are simply frogs of different colors because temperature and humidity in my tank are good. Frogs are in good form, active and eat well. And I also wanted blue frogs so much

. By the way, it seems to me that they are blue when they are little, aren't they?