the mag deficiency in clones and mothers is pretty cool if you think about why it happens- mag is mobile and the plant moves it around where needed and is paramount to chlorophyll production, keeping plants green!! So when all the new growth on a mother gets cut to make new clones all the mobile mag the plant stored in its leaves to keep green is robbed, then the new cuts diminish the little mag they have stored because its fresh new young growth and clones can yellow quick if not addressed. Most clone spray products are loaded with mag and I know some growers who use Clonex spray on mag hungry plants. And mag def. can show as a droopy plant, as well as the other tell tale signs- yellowing lowers, twisty whitish new growth to name a few. And Do Si do pretty popular, might find some info online.