Compatible bottom feeder with oscars?

  • We are currently upgrading MFK. thanks! -neo
A polypterus (bichir) might work as well, and in that tank you could even put some of the bigger kinds, or just a cheaper senegal bichir
 
Clown loaches would work well. Make sure you get larger ones as they grow VERY slowely, also make sure you get a shoal of them, they prefer to live in shoals. Other options include a larger pleco species, commons work but you could also try a royal, sailfin, rhino or other similer species. Your tank is large enough that you could have a nice sized catfish in there, a lima shovelnose might work, large synodontus species or even a bullhead species.
 
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