RI most likely. Usually by the time there are bubbles it is quite far along My advise is it is time for the vet you will need drugs to treat it with. Also check your husbandry very carefully it is often caused by something. I use 80 cool end 90 hot end 80-85 ambient air temps and 60% humidity with a fair bit of ventilation.
How much air holes do you have and what is the air temps not just the surface temps or are you taking local air temps and no surface temps?
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