I ended up taking several vids, it ate on the next one. Yup, there's 4. They're still fairly new here and the tanks been moved several times so the one was a ways behind, being a bit more finicky then the others, but it's slowly catching the others now with an extra feeding/day. Don't remember hearing of them being cannibals but don't want to find out either....
Wish I could trust something with them but have been fooled by their "cuteness" before and "fed" them some pretty expensive feeders..... lol. Maybe once they get a little bigger I could trust them with a big Clown Knife????
Think they might be a species only type unfortunately. I remember koltsixx losing a lei to a gulper that was about half his size, I guess long and skinny can roll up in the belly. I haven't heard of canibalism but I wouldn't put it past them lol.
A big enough clown knife may prey on them instead.
I'd think a pacu that's at least 1' could be safe with a 6" gulper. A twice longer swallow-able and bendable arowana and a twice longer disk-shaped pacu should elicit a very different response from a gulper.
I have no experience with pacu but I feel like the whiskers wouldn't last long on them, but I might have a skewed view of how aggressive they are. I wonder how the activity of a pacu would effect them though, whether they swim around more or hide frequently.