If your clown is being bullied it could explain its behavior. It could also be a short lived habit as clowns do weird things. Typically it is a case of being bullied though, IME. As for your earlier questions, filter what you read as there are some brilliant people on here and some that should watch what they post... Your clowns are going to be much larger than a percula pair. Your clowns will host what they want and they will do so when they want. You cannot force a pair to do anything, just offer them options. As for the coral hosting, yes it happens all of the time, but many times it is detrimental to the coral as the fish rub on the coral and stress it out. Lastly, hosting habits are not affected by wild caught vs tank bred... You should never take a fish out of the wild if you can help it. Wild fish bring in disease, are stressed by tank life, and removing critters from the ocean when avoidable is just bad practice. Support your breeders. ENJOY your clowns they are beautiful and Occ's are some of the most fun fish you will ever own or raise.