So our little froggy friend changes from dark green to kermit green pretty frequently, especially when he's hunting crickets or generally excited. But I've noticed him doing this strange mottled thing a couple of times now. The first time it happened (Wednesday) I cleaned out their tank really really well and then he went back to his normal color changing.

Yesterday I was so ill with a tummy bug I wasn't able to get out of bed all day and so didn't get a chance to check on him or mist them at all Then this morning he looks like this again.

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The little yellow spots are new too. The other frog is perfectly fine, but should I separate them?

Also I just got a heater for the tank (arrived today haven't installed it yet) as it's been getting cold at night. Could that be it?