Congrats on your two new geckos!
I've been keeping cresteds as my classroom pet for the last 7 years and they're great geckos. If you feed your cresties a complete diet (repashy or pangea complete or complete with insects) you shouldn't have to supplement extra calcium. If you feed any insects though, it is best to dust them with calcium +D3 powder.

I lost a gecko over Christmas break due to dehydration (was too close to the heater in my reptile room and by the time I caught it, it was too late), so I recently purchased a 6 gram baby crested myself.. .I can't get good pics of them though, mine is far too jumpy.

I've also recently gotten into gargs... I have one from a breeder now and have two waiting for shipping weather to come in.

Good luck with your cresteds!