Hello 
I am new with cresteds too. and i live in michigan as well, and went to troy and taylor last weekend
I got my little crested from taylor in september. I know it doesn't help much, but the breeder I got him from was named Rob, and I got it for real cheap. Its a gorgeous little flame phase who is doing excellent. he also breeds cornsnakes and leopard geckos. I have his phone number if you want to email me, I could give it to you. I've seen him at quite a few shows. I dont know his website though, sorry
but i know he is located around lansing because of his area code.
I feed mine just crickets for now. He wont even touch mealworms. I also give him peach babyfood mixed with Crested Gecko Diet, which he eats, but not very much of. When they are young you want them to get a lot of protein. I think as they get older, they will eat more fruits than insects.
As for the size, i'm not sure about the 15gallon. I have read that breeding pairs should be kept in 20 gallons, but maybe someone else can help you decide if a 15 is ok.
Good luck!
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~Melissa~
1.3 Leopard geckos
1.0 Bearded dragon
1.0 Hog Island Boa
0.0.1 crested gecko
1.0 Ferret
0.1 Chinchilla
1.0 Chinese Praying Mantis
Melissas Menagerie