I am having a ongoing problem with red alage. I have used the red slime to keep it under control
And that my friend is the problem with using chemicals to treat a husbandry problem. When you use the red slime remover, all your doing is treating they symptoms, not the cause, which is high nutrients and/or poor waterflow.
To end cyanobacteria (take heart, this can be a long process and it has or will happen to everyone), increase waterflow in areas that seem to be the most effected, look for anything that might be decaying in the area and fueling the algae. Do weekly waterchanges of 10-25% using RO
water, siphoning off the cyano
as you go. Top off the tank with RO
water. Look into the food your feeding to see if they are providing PO4
and look into higher quality foods, if your using frozen brine (not very nutritious) strain the water off before you feed, this is a big source of PO4
. Reduce the amount of food and if feeding multiple times per day, reduce to once per day or once every two days. If your not using a skimmer, start. If you are make certain it is running at maximum efficiency.