My frog was a nice green when I got him. he turned brown Friday night but I assumed it was him saying he was stressed since he was moved to the office the day before then back to my from Friday night. I turned off his light tonight before the temp in the tank got too high. come back 20 minutes later and he is brown again. I assume he will do this every night when the light is off? I know they change colors but never found out what the color change means.