I think this is kind of normal. My PCF/PTF's were doing something similar. I was worried at one point they were getting too fat, but then they would slim down after a few days. I think they have slow metabolisms and after a healthy feeding they may take longer to digest and look a little plump. After the food works its way through their system they slim down until the next feeding. This is all just a theory I have formed from watching mine.
Although I have noticed the fluctuations are not as dramatic when they are fed mainly fruit flies compared to a cricket. In fact just today Atwater grabbed a fly that snuck in while was changing their water dish, and it fattened him up quite a bit. I'm sure he'll slim down once it gets through his system.





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Skin looked nice and shiny and not dull though. Today he was sitting in the water dish taking a hiney soak, so never know.
I've taken to giving them the occasional cricket or two to keep up their strength, since they are fortified/gut loaded. They look a bit better afterward but I'm trying to not give them too many so they will still hunt. In fact #7 ate a couple of crickets then immediately jumped out of the jar and ate a wandering leaf hopper off the wall, so I'm glad the crickets give them the energy TO hunt. Pics (left to right) are bony #7, skinny #6 resting head on fat #5 (who had three crickets night before), #7 and 6 after having a couple crickets each, #7 after jumping out of jar to eat leaf hopper, and #6 getting ready to join #7 on the wall.
