Dave, I'm a little confused or uneducated, but I don't culture my grindal worms in water and I that plankton grows in the seas and oceans (salt water). Ed Join the AKA at http://aka.org/modules/tinycontent0/index.php?id=9 Archives are at http://fins.actwin.com/killietalk/ Modify your subscription at http://www.actwin.com/mailman/listinfo.cgi/killietalk