i have my heat lamp on a timer to go off and simulate night time, but when that goes off i have trouble keeping the heat up. i use an UTH on the warm side and nothing on the cool, but at night the cool side drops to below 75. someone told me anything below 75 is unhealthy, so i got a infrared heat lamp and that is not doing the job too well. does anyone use an under the tank heater on there cold side too? i know i should get a thermostat, but the price is a little out of my reach right now. any suggestions?