You can use a UTH on anything. You just need to control and regulate it with a thermostat. Like a herpstat or herpstat. Its as simple as a sterilite or rubbermaid tub with a few holes drilled in it. A good latching lid. Not the ones where the lid just barely clips down. A UTH big enough to cover 1/3 the bottom (one side). Most people donr adhere the UTH to a tub but rather just let it lay on the table or shelf and put the tub on it. Shouldnt be a fire hazard as long as you use a good therm with the probe directly on the UTH.
Be sure to disinfect the aquarium with bleach and water to kill anything. Always quaranteen new animals for a few months in a different area to be sure they are healthy if you get something else to go in the tank.