Perhaps at some point you missed a few crickets and left them in the tank, and he ate them. It's also not unheard of for a HL that hasn't eaten in a while to pass scat ( defecate ) from waste material that was still in the system.

It is a sign that the digestive tract is being cleared and he's getting enough water to not only clear out what might be old digestive waste, but to release nitrates and other waste products in the urates.
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"A man that should call everything by it's right name, would hardly pass the streets without being knocked down as a common enemy." The Complete Works of George Savile, First Marquess of Halifax 1912,246

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