I was wondering this myself and no one seems to want to help me.. My tank water stays at 20 C thats it no cooler not warmer I was wondering if this was ok or if I need some kind of heater or basking erea. They do seem a little sluggish but still move and eat ? Can anyone help me here on this thread , I do have a UVB light that goes all the way across the tank and is on 12 hrs of the day and off 12 hours of the day . I also have a 20 gallon tank with 5 inches of water . can anyone help me . Here is my tank set up .

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