Hey Rob,
Congrats on the new addition. You can tell when your crested has floppy tail syndrome while they are hanging upside down on the side of the tank. If they can not keep their tail straight above them and pressed to the glass, that’s usually your sign. As far as I know no one really knows what causes it. Some say calcium deficiency, lack of climbing surfaces, combination of both, etc. Could even be genetic, something we might see more of with the increased inbreeding that’s going on.
There are quite a few people here who use the CGD exclusively. I personally don’t like the prefabed stuff and go natural as best I can. All my guys get crix with ripe fruit supplemented once a week or so. Young animals esp thrive on a diet high in insects. However the CGD was designed to replace live prey. It has been debated a lot, so you might want to check the archives.
Crested geckos can not change colors like a chameleon per say. All they do is lighten and darken to a degree depending on their mood. A dull brownish orange crested can be a brilliant orange and all shades in between. Polymorphism refers to their genes. I am not sure how familiar you are with genetics but I’ll keep it simple and try to explain it to you. We all have two copies of each gene, one from mom and one from pop. It is a back up system incase one of the copies is bad, we at least have one that works. Let’s say the gene for being an albino is represented by “a” and the normal gene will be “A”. In leopard geckos a normal looking adult can have two possible combinations; “AA” or “Aa”. I won’t get into all the fancy names and origins but the second one is called a Het for short. He has one bad gene for albino and another perfectly good one. However the good gene takes control and normal colors are produced in the leopard gecko. If an “AA” is bred to an “Aa” you have a 25% chance with each egg that it will be “aa” or albino. If you breed two hets (Aa x Aa) together your chances increase to 50%. And finally once you get two “aa” or albinos and breed them together all hatchlings will have “aa”, because both mom and pop have bad copies of the gene “A” and there is no way around it. Make any sense so far? Quite a few leopard gecko morphs work like this, such as blizzard and pattternless. Polymorphism is much more complicated. Instead of color and or pattern being based off one gene like our simple albino was it’s based of many. For example the gene sequence that represents a specific color and pattern in a crested gecko might look like this “AaBBccDDEeFfggHh”. So unless you have a pair with the same exact set of genes your going to get a lot of different looking offspring, because there is a large number of possible combinations in there. It is possible to get it under control and produce “aabbccddeeffgghh” or anything in between but it will take years of selective breeding. But breeders have to remember you get the good with the bad and if their happen to be any undesirable traits linked to a specific color it to is also going to be expressed, like kinked tails, large heads, eyes, etc. It is something you see in leopard geckos because of all the inbreeding. You def want to avoid as much as you can by bringing in fresh stock.
Anyway I know that was a bit long but, but I hope it makes sense now. If you need anymore care info Rob, just drop me an e-mail and I’ll send you an complete e-guide on crested geckos. Best of luck with the new addition 
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-Mike
