Hi, i am setting up a 8' x 2' steel stock tank in order to raise goldfish and supply my unused farm pond which has become overrun with watermeal and some duckweed. I was told small 1 - 5" goldfish and grass carp are the only fish that will eat this, they say after fish get larger than 5" the small watermeal just goes through their gills. N.C. only allows sterile grass carp so that's out. I hope to raise goldfish to eat this stuff, if anyone else knows of a fish I could raise to eat watermeal, please let me know.