matt: first off, welcome to the tank!
secondly, you probably should have posted your own thread for this one instead of tacking it on as a reply to a completely unrelated discussion. not scolding you... but you're more apt to get replies when you start your own discussions =)
now, the bad news: two pictus cats in a ten gallon sounds like a very bad idea. they don't have enough horizontal swimming room in there to thrive... especially when they grow to full size (recommended minimum tank size for them is 55 gallons). i would take those guys back or get a bigger tank before you even think about adding a big, poopy pleco to the ranks.
the "freshwater fish profiles" tab at the top of the page is a good resource to get you started in looking at the basic requirements, temperament, average prices paid, and other people's experiences with the fish you're thinking about getting.