PlanetCatfish.com

These are commonly called bulldog plecos (<i>Chaetostoma thomasi</i>), and they require cool, fast-flowing water. They also tend to be somewhat territorial.

Thanks. So I guess they are a south american cat.

How territorial? I'm probably going to leave him in the 10 gallon quarentine tank for a while to grow him a bit. He's quite small. But after that, I'm not sure if I should put him into the 90 gal, that already has quite a few bottom guys (I'm also afraid the royal will pester him), or into the 40 gal, which will eventually be switched over to a fish tank (right now it houses 2 crayfish.

any thoughts on that?

They are territorial, but not overtly so. They do a fair amount of chasing, but other than that, no other harm done, so I think they should be alright with most other bottom dwellers.