So long as it's thermostat regulated it will be fine. The heat tape won't ignite anything as long as it's in a safe temp range. I had mine pressed against the cage with a sheet of plywood when I used belly heat previous with no issue.
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That's my concern as I have my thermostat set at max right now, but hopefully if I have it pressed up against it, it will allow me to lower the thermostat.
How did you secure the plywood onto the bottom of the tank safely?