I would read this:
http://netclub.athiel.com/cyano/cyanos2.htm
I’ve read the article and many others because I have had a huge outbreak. It was all my fault to. I didn’t notice my refuge crashed ..zero lighting = dead cheeto and micro algae..
Cyanobacteria form up and if you have a large outbreak or fast growing you will have false readings on tests. Why? Cause they are eating it all up.
You have to treat the source before you attack Cyano. Number one thing I learned the ‘very’ hard way.
Sources: Nutrients in the water are very high. What ever reason is going to be by your tank and your habits. Over feeding, Low flow areas, Protein skimmer needs cleaning or better one , lights went bad hitting spectrum that encourages its growth, lack of proper tank maintenance (using tap water top off, not so frequent water changes).
It takes the right conditions for an outbreak to happen. And mine was due to my idiocy.
I treated the source. Nutrients in my water were high.
Kent marine Poly-Ox assisted me by helping my skimmer out…
I cleaned every rock ..suctioned every bit of slime I found..and identified my source of nutrients and removed it.
Once I removed my nutrient source I attacked it with blue life red slime remover.
Currently I am enjoying a Red Slime free tank. And I am now doing preventative steps.
1. proper water change outs and top offs
2. 48 hours before change I use chemi clean
3. Keeping my cleaning crew stocked
4. Poly ox treatment.
Poly Ox does this: Poly Ox is an organic material oxidizer. It does not contain any algaecides. It assists in preventing growth of various cyanobacteria (commonly called red or blue green slime algae) by simply removing their food source. It will oxidize leftover food, and dissolve and suspended organic matter.
I hope this helps you.
PS. My first outbreak was due to hair algae and letting it cover one rock ...then applying the algae control stuff (forgot its name)..well hair died off and added nutrients= cyno broke out right ontop of the hair algae... long story short..> My Slug of hair algae eating death is in my tank now! I love my slug.