The mack snow in your picture isn't an albino because it's black. It is a reverse stripe, though. Without knowing the genetics of the parents, you can only determine the visual morph of a gecko. This means, for example, that you can tell whether a gecko is an albino or not, but there is no...
I'm not sure from the pictures how many different geckos are there. The first one that's yellow with the beige stripe in the middle is an albino, though there's no way to know which of the albino types it is. The stripe down the middle makes it a "reverse stripe" as well. There's one other...
It does make a difference if you're planning a leopard gecko enclosure or an arboreal gecko enclosure (crested gecko, gargoyle gecko etc). The arboreal geckos won't be spending that much time on the substrate and their enclosure will be a lot wetter. Here are some articles from Gecko Time...
It can sometimes be heavy, it gets muddy when wet and it may have stuff in it that you don't want in your tank, though I don't worry that much about that. It's mostly the weight and the muddiness.
Aliza
Here's an article written awhile ago by someone who had a very successful leopard gecko bioactive enclosure. I'm also including a link to the previous article where she discusses the leopard gecko's native habitat...
I responded to your other post. I forgot to mention that I actually don't use a thermometer or hygrometer. I mist every night and my house is comfortable for humans even in the winter, so I don't worry about humidity and heat.
Aliza
Congrats on your gargoyle gecko plans. You can use the substrate you're planning on. An easier alternative is to get the substrate that doesn't require a drainage layer from Joshsfrogs.com. If you have trouble finding it, send them an email; they're very responsive. I have the traditional...