Sandra, it sounds to me like you are a caring and responsible person with your animals, and please know that I never meant to imply that you were otherwise!
It sure sounds like to me that you acquired the young geckos in that condition. Remember that pinworms and some other parasites are found in many reptiles as a normal part of there existance, it's just when they get "compounded" into there system from there constant exposure that it becomes a problem.
And be careful about getting your geckos hooked on that slurry, I started using it and It took weeks for me to get back to using a cheese dip with my chips!!!
J/K
Hey, good luck..sounds like your geckos are in good hands!