Orinoco River Biotope

[FishyFreak]

Hey Guys,
I started cycling my 40b a while back, and it is ready for fish. So far on my list I have:
x20 cardinal tetra
x3 GBRs
x4 otos
x6 rummynose tetras.
I did "cheat" plant wise and a bit with fish, so it is more of a South American tank, but i would like it to be as close as possible to an Orinoco River biotope. Any suggestions fish wise?

 

[Dallascowboys16]

Maybe a bristle nose pleco of some kind or a group of cores from the area you are trying to replicate.

 

[FishyFreak]

Thanks!
Unfortunately, I have a larger grade of gravel for the substrate, so I don't think it would be good for corys. I am definitely thing about a bristlenose Pleco. Would Keyhole cichlids be good?