I had my 3 RETF for over a year and they been doing great. There is one now though that has been sleeping for over a week straight. I am up to at least 3 a.m everyday so I believe he is not waking up. He is on the back of the glass. Very fat but doesn't wake up for some reason. Is this a problem or do they do this from time to time? Never seen them do this before? Color looks good. He is a dark green because he is in a darkish corner. I have a 18x18x18 tank. Temp during the day 75-85 night 70-75. Humidity around 75-80.