I have used Live Aquaria (aka Fritz RPM) since I started my tank last July. I have not had the Red Slime (cyano) problem. The only issues I have had were a Briopsis outbreak, which I now have eliminated and do not attribute to the salt, and extremely high magnesium. I made a fresh batch last weekend at 1.026 salinity and the magnesium was over 1600, calcium was 450, and alkalinity was 8.5. I have had this level of magnesium in my tank for months. I am going to change to HW Marinemix Reefer salt in order to get the levels down. The box came in today and I plan to mix up a batch and test it this weekend.