Crowntails are a morph of Betta splendens, so anything that the sticky says will apply to crowntails, veiltails, half moons, double tails etc. Think of it like blondes, brunettes and redheads, they're all humans, just look different
I have seen some fabulous bettas for sale on Aquabid (many from Asia), I just don't want to go to the trouble and expense.