My pond right now has a mat of pretty much pure Azolla. It started from 3 or four pieces I put in the pond in febuary and we've already flushed the pond out a few times. Join the AKA at http://www.aka.org/aka/modules/content/index.php?id=9. Archives are at http://fins.actwin.com/killietalk/ Modify your subscription at http://www.actwin.com/mailman/listinfo.cgi/killietalk