The link doesn't work, but I think it was on thePACK's post the other day about bucktooth tetras (Exodon Paradoxus). however if you are looking for info on payara then I saw a thread on them also, just look for it, it was posted today.
Well right now they're alright. The ps try to get them but the exedons are just too fast. They run circles around my red bellies. Its funny, and it keeps my ps in shape. Hope it stays that way. Also, I put a little crayfish in there, thinking it would get eaten, and they wont eat him!!!!
I just but a 4" crayfish in my tank, lol and he was defending himself good. Untill one of the adults seen him and they ate him from the back to the front, then one of my p's swam around with his claw in his mouth like he just won the olympics lol