I picked these up somewhere along the way and can't remember (if I ever knew) what they are. I'm selling these with ones I know about and don't want to mislead a possible buyer.
The black one is about 4.5" and the brown one 10+" (in stress coloration from being yanked out for photos).
The first looks like a Hypancistrus, maybe H. contraden/inspector/L201. And the second, well it's Hypostomus but there are dozens of brown spotty ones. You'd need to know which river is came from to come close.