I could use aluminum tape to hold the old UTHs to the tanks, if that is safe. Plus, I'm thinking of switching the BP to a tub in the near future and it just doesn't seem that UTHs would be very safe on plastic would it?

And the baby corn is inside a decoration at all times. Putting a towel on him won't work. Thinking I may need to take the decoration (fake tree) out and provide him with easier accessible hides instead.