when I was at my LFS getting sand the other day I saw a little minnow swimming around in a plant holder. There was no filter or anything. Can minnows really live in non filtered/aerated water? What about the rosey red minnows?
There is normally a system filter filtering the plants tanks. How big was the tank? Minnows do live in slow/still waters in the wild but I it is always recommended that you keep them in well circulated, well oxygenated waters like the majority of wild specimens are.