they should all behave specially if u grow them all up in the 150 together that should be plenty of room ive had alot more overstocked tanks in lower gallons.(from inexperience and free fish being dropped in my lap they were just gunna throw away). just a thought you could throw a cool catfish like a tsn in the mix and like a charro or whatever would be cool or like 2 rocket gars would be fine in the tank. basically what i have noticed over the years if that if the fish grow up from juvies together they tolirate eachother alot better then when u grow 4 fish up then they become really territorial so theirs no fresh spots for them to all claim. idk just a few thoughts buddy