Two aggressive rainbows. Which one needs to be re-homed?

WiccaFish

I have a group of rainbows and two big ones are become aggressive with each other and every once in a while going after my other fish. One is a trifasciata and the other is a lacustris. I originally had two lacustris but the smaller one passed away last week. I'm assuming it was so stressed by the aggression of the other two.
I really don't want to give one away but I feel I need to for the safety of my other fish. I may consider re-homiing both since I've read both types are very aggressive.
Have to correct the one fish. It's aggression between a Trifasciata and a Boesemani
 

86 ssinit

Are you sure it’s aggression and not mating. Rainbows need one male to 3 females to keep aggression down.
 

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