That trigger would be like a porsche and the pirahnas would be the vw. I used to do the freshwater pirahnas and mine were so lzy cause they knew they could kill anything that got put into the tank so when it was feeding time they would eat at there on leisure. When feeding time comes for my saltwter tank and I have a humu humu watch your fingers cause they will get bit. If you get the undualte they look awesome and are killer aggresive that would be my choice for the fish.