Using a UTH with natural bedding can be tricky, as the UTH has to get appreciably hot to heat through all the bedding. This is often a frustrating point for people that want a hot spot, and still want to use bedding. Try to use as little bedding as possible. Using a substrate like paper towel makes this a lot easier, as the temperature that the UTH needs to achieve with paper towel on top is much lower than with mulch on it.
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