On 18/09/2011 08:22, Bob wrote:
Careful, Stewart. A LOT of ocean beach sand is crushed coral. The sand that builds up in freshwater streams and rivers is all kinds of things, but not Calcium
I guess I forgot that. I always associate sand as coming from the beach. It doesn't of course. Thanks. :) -- Stuart Halliday http://mytriops.com/ 200 Million years in the making... _______________________________________________ Aquatic-Plants mailing list Aquatic-Plants at actwin_com http://mailman.actwin.com/mailman/listinfo/aquatic-plants