The most predators?

[BRAVO~ARMADA]

and people are saying ps are cowards because well they are they wont attack anything that will fight back unless they greatley outnumber it ive stuck my finger (DONT DO IT) in a p tank only to watch the 3 of them cower behind a log

 

[Mathieu914]

Exodon seems to be a good choice. I made a little research on web and it says that I can mix up Piranhas with Exodon, is it true?

 

[bitteraspects]

to put it simply... NO.

has it been done in the past? yes
has it been done successfully (over the life span of both species)? not that i have found in all my studies
should it be done? absolutely not