even if you cant see it, the Cyano is there.

This hobby has many different ways to accomplish cures to issues. As long as the remedy doesn't harm your tank, then go for it. Find a way that you are comfortable with. Chemicals are not the answer to all issues, and I really don't like using them, but sometimes action needs to be fast and effective, with imediate results. Anyone that doesn't feel comfortable using Maracyn, shpuld not use it, but its served me, and many other very well seasoned reefers in the past.