What kind of fish do you put with a large algae eater?

you can put an algae eater in with any tropical fish, I even have a goldfish in with my tropical fish now for almost 8 years. Pet store say no but i beg to differ. 8 yrs going strong, gold fish, algae eater, angel fish, silver dollars. Some fish are more dominate over others. I have learned no matter what they are if they are put in the tank, all as new fish as the same time, they all get along. After one dies, then as time goes on a new one has to earn its peck so to speak, so new ones get picked on. I have an algae eater and a cat fish. all is good.