They have strange eating habits.
Will take any pellets meant for my Oscar.
Will take all pleco wafers meant for my plecos.
I tried waterfleas, bloodworms, mealworms,artemia, they love it all.
But when I put in Lettuce or spinach they all hide!
They were sold to me as planteaters, but when I still had live plants in my tank, they didnt bother to eat those.
They love the pieces of Zuchinni that float around after my pleco eats like a pig.
They supposedly like to gnaw on a dead fish or shrimp sometimes.
And last but not least if one of your Dollars gets sick, the whole bunch may join in to eat their sick tankmate...
I was surprised about that but there still related to piranhas.