Scariest for me was hand feeding a 12' pool of monster fish and rays. There were 30" pacu, dozens of rays from 18-24" and all kinds of predators. I was watching the lone dorado in the 20" range and when he got 12' away I made a move to feed a ray and something grazed my hand n knocked it out of the way. Sure enough the dorado was swimming away with a hotdog and I was glad it wasn't a finger. I'd handle 1000 huge rays by hand over one unpredictable charicin. Rhom is the only fish I've owned that legit scares me to have any part of me in the tank