A. adonis and A. hystrix are both territorial carnivores, one gets just over 2 ft, the other gets over 3 foot.
Personally I think it doesn't make any difference on species. Obviously, the carnivorous plecs are less likely to work, but in reality, a Panaque, an Ancistrus (bristlenoses), even the rubberlips may or may not go for the slime of a bichir. The reason they don't normally go is because a bichir doesn't bother moving when a pleco clambers all over them, they develop a taste for them, and then it's too late. I wouldn't risk a bichir doing it, but I think it's going to be more down to pot luck than be species specific, as it definately isn't a species specific trait.