I don't know about the hottest, they've been pretty popular for the last 5-6 years. The only difference between then and now, is that they just recently went on the the CITES list, and have now tripled in price. Before you had a choice of wild caught species(cheap), and captivebred(expensive) but much more reliable. Now captivebred is the only thing available, thus the thru the roof prices. I might add I'm glad to see them put on CITES. hth