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I don't know if it all depends on stress with cresties. Often during the day they are lighter. If you have ever seen a crestie sleeping half under a leaf half of it's body can be somewhat fired up where the other half is pale. They seem to fire up more at night which may also be for breeding purposes. I'm just not sure it's anyone one thing that gets them fired up, I guess I always thought of it as the mood they are in and in a sense the personality of the crestie. So sum it up and then stop rambling to fire up means that their color intensifies, why they fire up I think is a multitude of reasons. That is just my opinion though.
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