I would say no on the tinfoils not enough room for a school of them.convicts one would probably be ok but pairs can be very aggressive pictus are cool and not very aggresive,severum sounds good.a few firemouth sounds good
how bout a p.delhezi or 2
I'd really recommend a Ctenopoma Acutirostre or Ansorgii, they are pretty passive and would get along with the Fire Eel. Same for a species of Nandus.
those are some neat fish, they have one at my LFS for $30.00. Is that a good price?