First one Pterygoplichthys based on the dorsal rays.i agree, they do seem like they come from the Pterygoplichthys or Cochliodon group. Would like to see more photos. cheers jk :thumbup:
The first one can't be a Hypostomus Punctatus as it has over 10 rays in it's dorsal finI was going to suggest Hypostomus Punctatus which has probably been renamed since I remembered it from. Quite a few of these around Essex LFS at the moment. Very interesting alternative to the common plecs.