Hi Roy, I had the same problem in my planted tank. About a year ago I started adding a small amount (1/4 cup in a 55 gal) of crushed coral to my filters and noticed a big improvement. At the same time I also started to add Potassium supplement to my tanks and an even better results. This worked in my tanks and I couldn't be happier. Vanessa -----Original Message----- From: gsas-member-bounces@thekrib.com [mailto:gsas-member-bounces@thekrib.com] On Behalf Of Seattle_Aquarist Sent: Sunday, June 28, 2009 8:31 PM To: gsas-member@thekrib.com Subject: [GSAS-Member] Soft Water; Plants; Calcium; Magnesium Hi All, I have a problem; my water is very soft coming out of the tap. Even though I do a 20% water change weekly, my plants periodically exhibit symptoms of calcium and sometimes magnesium deficiencies in the form of leaf deformities and slow growth. When I add additional calcium (calcium chloride) and magnesium (Epsom salts) my plant perk up, grow more quickly, and the leaf deformities decrease or disappear altogether. My question is, do you add anything to you water to increase the calcium or magnesium concentrations in your tanks? If you do add these minerals, would you share the information as to what you add, when and how much? Thanks, Roy _______________________________________________ GSAS-Member mailing list GSAS-Member@thekrib.com http://lists.thekrib.com/mailman/listinfo/gsas-member _______________________________________________ GSAS-Member mailing list GSAS-Member@thekrib.com http://lists.thekrib.com/mailman/listinfo/gsas-member