Thank you Rochelle W. for the info on the book on Apple snails. I didn't even look at that book thinking it was only on Apple snails. In A.P.Digest V2#468, Dirk says, "What a cool list, eh? One minute Botany, next chemistry, the next electronics, the next fish...." Yes it is. You could say one list/digest shopping for everything to make the planted tank/world work.