It sounds like you're doing well and you've received some very good advice. With Pearl, Starr, and Ziggy, I just let them roam around and usually within 3 days to 1 week all of the hissing had stopped. I didn't have an extra room to put them in so they couldn't be introduced as slowly as I would've liked them to be. I'm sure that Taz will eventually accept Paizly and maybe he'll even start playing with her. Good luck.