The friendliest place on the web for anyone with an interest in aquariums or fish keeping!
If you have answers, please help by responding to the unanswered posts.
How big was the pleco versus the oscars? I just got some BN plecos and am letting them grow out a bit in my 46 community before I put them in with my blood parrots.
An Oscar will eat anything up to half its own size, sometimes larger depending on the shape. Many years ago I saw a 3" Oscar at an lfs with the tail end of a baby snakehead nearly the same length hanging out of its mouth.