chances are, none will do good solo in a 65g tank, let alone tossing the 3 of them together.
jags are mean as hell, and so are FH. its not a wise choice to mix anything with those fish. in my opinion, once they reach 6-7" jags and FH should be the only fish in a tank, otherwise you have a very high risk of losing all fish in the tank
i'd say its better to just keep the same species together.. dont chance it... managuense aren't as aggressive as some FH who are mixes of Midas, red devil, parrot...... too much to really say..