Very interesting Oli, and congrats for your purchase. You will be glad to know there will be an article on the Ptenopus genus in the next issue of the GGA Journal, Gekko.
I have
P. kochi, do your
P. carpi are also able to move backwards really fast?
I agree on large prey items. My kochi feed readily on crickets and subadult, half an inch locust, but what they prefer is silverfishes.
Two common mistakes with these geckos are:
-to offer them a THICK layer of sand; you will notice they will dig all the sand away and stay at the bottom of the tank. Geitje/Jon told me to use fine sand, no more than 1 inch/2 cm thick as a substrate. They have fringed toes, to help them move fast on sand. I use PVC pipes and cork bark pieces as shelters, which they readily use.
-to keep them in groups, as they are known to live in colonies of several tens of individuals in the wild. Don't do that, keep these guys in pairs or trios, not more. Otherwise they will bully each other.
Sexing them is not easy when they are young. Even as adults, they hardly have bulges, due to their sandy habitat.
Some males of the same species do vocalize and have colored throats, while some males don't- this would maybe indicate different subspecies.
I keep P. kochi for about a year and a half and I have not noticed they get fed up of the same diet. But I have also heard the opposite on P. garrulus, especially when the latter are WC.
Oh, and kochi are active even at daytime, maybe that is a noticeable difference in behavior with your carpi.

Hope that helps guys
