My male normal remains on the cool side most of the time, yet he's healthy, happy, eating regularly and gaining weight. I've tried many times to put him in his warm hide but he always ends up back on the cooler side. I've even lowered the warm side to 88 and switched the (identical) hides.. still stays on the cool side, lol. If your temperatures are good then I don't see any reason to worry. If he needed to warm up, I'm sure he'd go to the warm side.
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