Depends on a few things. The main one being the temp of the room it will be in.
A under tank heater is not going to do anything for the air temp in the cage, and should only be used with a thermostat.
The Vision cages have a screen on the back side of the top that can accommodate a heat lamp, or just a light. So you could do a lamp with a dimmer to dial it in.
Or a radiant heat panel. They seem to be hard to get at the moment though. I know Pro Products is behind. This also will require a thermostat.
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