Yeah, definetly agree with you. I was informed by local pet store that 2 or 3 should be fine, but no. Luckily I had another tank to spit them up by moving one. Geez, never seen fish fight like that. They're both okay now. I'm probably going to keep them in two tanks from here on out, I don't have the money for 3 or 4 more.
You could try putting other similar sized fish with them as a distraction.. i used 6 scissor-tails, they're being outgrown and eaten now, so i put in a couple of larger silver sharks.. hopefully they'll grow along with the tigerfish for a while..