The glass will 'buffer' the snake from the spikes that occure with all on/off t-stats. They work reasonable well with heavy enclosures and well not directly heating light weights but are not very safe with direct heat on a light weight system (heat source attached to a plastic tub, the spikes can be higher than expected) Glass should be fine, I'd re-think that T-stat if you chose to switch to tubs at a later date.
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