If not, keep in mind that some substrates, or any THICK substrate, will reduce the effectiveness of an UTH even more. It's best to stay with a fairly thin substrate layer if you are using a UTH with nothing else.

That's a bit misleading. A substrate, even a thick one, can increase the effectiveness of a under-tank heat source by increasing thermal mass. In fact if anything it's best to have thermal mass in a glass tank when using only under tank heat.

I went into this in more detail on the caging forum where this topic was cross posted.
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Current snakes:

0.0.1 Gonyosoma oxycephala - Java locale (green)

1.2 Gonyosoma oxycephala - Jave local (green)

2.2 Gonyosoma janseni - Seleyar locale (all black)

1.2 Gonyosoma janseni - Celebes locale (Black & Tan)

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