Hey guys
I have had some... well, more specifically, one in the past, and two current.
First one I rescued as a 2 inch baby - leucistic - absolute sweetheart, and got along with everybody. Started out in a community tank, then into a cichlid tank, then in my oscar tank, and eventually summered in a pond, and wintered with an oscar - they were best buddies. It was a girl, and she would eat anything and everything. Back in the day when I still used filter floss (Remember that stuff?) she would bring her head out of the water into the filter, and pull the floss out and eat it. Never caused problems. She was perfectly compatible with everything else. She would eat guppies, however.
My 2 present ones are a gray one and a leucistic one. The leucistic is very mellow, while the gray one is crazy. Both are about 4 inches. The gray one is a total glassbanger - Right now he is in a quaratine tank (As is the leucistic) as both are recent purchases - and he has mellowed out a lot - so maybe it was just a hungry response at the store (Although the leucistic, kept in another tank, was very shy there.)
I could not ask for better fish - they are wonderful, have great personalities, and are right up there with Oscars - and they do make great tankmates.
They DO bully one another, (From what I have seen at stores) so I have not attempted keeping two together. (These were juvies.) But other than that, they are just big fish that are happy go lucky.
And no, I don't think you will EVER be able to keep any plants with them. As youngsters they aren't so bad but when they hit that 8 to 15 inch mark, they will eat anything they can rip apart, and that is pretty much everything that you put in there. (this does not include fish)