I got some jags and Oscars. they are swimming around with some full-sized cory's. Its very peacful by now.
But will they attack and eat them when they get big enough?
Well then i think they will leave them alone.. i buyed some flowerhorns from a guy late in the days he got one big flowerhorn and a big arowana and some cory's.... They leaved them alone
Its is very likely that they will eat them, I've heard of smaller and less agressive species chowing down on Cories and if the Oscar or Jag is unlucky enough to get them snagged you will have killed two birds with one stone...