Oh, pet stores often mislabel their fish....I doubt most of them know a PK male from a VT female! xD Its not your fault he was sold to you as a CT!
Haha, there is a lot to learn about breeding and a LOT to prepare for! Its definitely not an easy process by any means, let me tell ya, I learned that a few years back! But watching those hundreds of adorable little fry grow up is very rewarding. xD
Ahh, I bet once hes all set up in the spawning tank with the right conditions he'll start nesting nicely for ya, especially if hes a good nester already. ;)