I think I've collected them from my brother's horse trough. He has them electrically heated in the winter, and are the only live food my fish get in the winter. Are you talking about little bitty things that look like dots, swim in circular, curvish paths, and can take on a greenish or reddish look, depending on their diet? Bob Dixon Cichlid Trader List Administrator http://cichlidtrader.listbot.com