Jump away its a forum not a private party..... from all of my experiance in keeping fish I have seen that trying stuff is one of the best ways to learn. That is before I found online forums now advice can be handed out on what one persons experiances have been with many situations, this leads some people to belive that something is not possible. When in reality there are so many posiblities. Its all based on a fish by fish bases. If one of anyone of those three is extreamly aggresive then the other two fish will suffer. If they are all on an equal plane or understand and get the idea of pecking order it could also work. With some fish this is simply not an option if you have two or all three think they are the alpha there will be fighting and constant harassment. As far as space goes in a 150... hard to say for me that's a close one. I have kept together some pretty big fish in tanks around that size and fish with way more of a reputation for being vicious killers... but in these instances the fish all grew up together and there were boundry lines and each fish knew where they were.... "disaster is bound to hit anytime you put 2 aggresive or even semi aggresive fish together" that's in "" not because its fact or that anyone else said it but because its my mind set when setting up an aquarium. This way you are prepared for most all negitive situations that might and probably will occure. I have 6 tanks, 3 are 6' long and there is still no way to know what is going to work only what might work and what I haven't tried yet... I hope that isent more confusing then it is helpfull. I would probably lean to saying no. And this is just my opinion. The reason for my opinion is the max size of these fish if they are males. A full grown pearsei can be 17 inches long. The foot print of a 150 is only 18 inches from front to back. This allows only one inch of room to turn around and with a forward motion it would not be possible without the fish bending its body. So with proper filtration and heavy water changes coupled with fish that for whatever reason get along well, could it work? Absolutly. Should it be allowed to work? That's up to you. But in my opinion a fish reaching anything more then 15 inches should have a minimum of a 24 inch deep tank. Once again its all up to you and these are only my opinions.. I hope I was some what helpfull.