What temperature is best for a leopard gecko with a 24/7 red light?

Thanks for reaching out about Dwight. Do you know how cold it is getting at night? If dropping below 70, probably needs a red heat lamp or ceramic heater, neither of which should affect his diurnal cycle. Good luck.

Thanks for reaching out about Ruby. The tank needs to be warmed to 95-100 F in the basking area and no place in the tank should drop below 80F at night. UVB spectrum is important as is the proper diet. Anorexia for 3-4 weeks is serious and a veterinary visit is recommended to assess and provide a diagnostic/ treatment plan. Intestinal parasites, infections, malnutrition and others are possible. Good luck.

A heat mat will maintain proper ground temps but may not keep ambient temps within normal ranges for a leopard gecko. A basking light should be used during the day to mimic the natural environment. If nighttime temps drop too low, even with a mat, consider a CHE (ceramic heat emitter) that will produce heat without visible light.

It is okay for nighttime temps to drop a bit. Make sure they don't go lower than the low 70s F. Consider a thermometer at each end of the enclosure to verify temperatures. If necessary, a 60 watt CHE would probably heat or maintain temps above the low 70s F in a small tank overnight. You would need to test it out. Save the receipt in case you need to return it or buy a 100 watt CHE and move it farther away from the tank.

First i would recommend describing exactly what type of heating system you are using at the moment. this following link might help you: https://blog.onlinegeckos.com/leopard-gecko-heating-temperature-requirement-under-tank-heating-pad-belly-heat-how-to-install-uth-thermostat/

I think leaving the red light on at night is fine. I would try not to let it get below 60s at night. I am going to attach a great resource about husbandry and diet for your bearded dragon to help give you better guidelines on his temperature, lighting, and diet. I hope this helps. http://www.anapsid.org/bearded.html

The basking spot should be about 90 F. If you use a standard heat lamp on one end of the enclosure, it should produce an acceptable temperature gradient across the tank. Nighttime temps should drop no lower than the low 70s F. This species is a desert species. Relative humidity in the tank should range between 20% and 40%. When in shed, provide a moist or humid hide box to aid in shedding.