TWoods :

Here are a couple links to pics. of fatheads (FH):

http://www.cnr.vt.edu/efish/families/fathead.html

http://filaman.ifm-geomar.de/Summary/SpeciesSummary.php?id=4785

http://www.gen.umn.edu/research/fish/fishes/fathead_minnow.html

If they don't look like what you have then look to see if you can id them at this link -- efish

http://www.cnr.vt.edu/efish/families/cyprinidae.html