Those temps aren't terrible during the day. Could be a touch warmer, minimum 75, at night though. If you do spring for a UTH make sure you get a thermostat as well. Most important piece of equipment you'll need regarding heating element temp regulation. You may want to bump up to a 100 watt bulb and a lamp dimmer or get a CHE (ceramic heat emitter) and use a dimmer on that as well. You'd want a lamp with a ceramic socket if you go the CHE route too
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