On the cap of my bottle of SeaChem's "Flourish" there is a sticker that says to refrigerate after openning, which I did. Well, I was wondering; Is this really needed? I haven't seen any comments on here about refrigerating PMDD or any other trace elements or mineral mix? What is it (or in it) about Flourish that requires it to be refrigerated? Allan Tomkinson atom at salisbury_net Uhm. I need some text to go here.....