Just to be clear, you only have the one heat pad right?
I don't think it's going to do you any good on the glass. If it were, I don't think the snake would be up against the glass like that. If it doesn't heat through the substrate, you can use less substrate. That looks like a pretty thick layer, I don't think anything would heat through it.
That looks like a 55 gallon to me. I would consider downsizing to a 20 gallon long or something around that size. A 55 gallon is pretty tall to have to heat up and the snake isn't going to use that vertical space. But to answer your original question, no, that heat pad alone is not going to be good enough for that cage, especially if it's on the side like that.
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