tgray3;354292 wrote: I had 2 little spots of Cyano that really didn't bother me too awful much as they never spread and were hard to see. I had been doing some reading on bacterial supplements and how they can benefit a tank and insure that your existing colony stays healthy. I figured it couldn't hurt so i ordered some "Nitromax Marine" bacterial supplement from F&S. I know it sounds a little flakey and i thought this might end up on the "What was i thinking" list. I added it according to the directions and the next morning all the cyano was gone. This was 2 weeks ago and it hasn't returned and the livestock are healthy and happy.