About 10 years back I stuck a couple of native(to Ontario)catfish minnows in one of my aquariums, thinking that they would be interesting scavengers. What a shock!They started out 1"long, within a year they were 4" and by now were in their own tank, eating minnows from the bait store and my minnow trap. No problem with anything 1/3 their size, including sunfish!(blue gills)
