fastrd400
It wasn't me!
No amount of blackouts are going to fix this issue. Also, your water parameters can not be "spot on" if you are experiencing an issue like this. The Cyano needs nutrients, and is getting them form something in your water column. You obviously have a phosphate issue. So you need to look at everything that goes into your tank, from food to top off water, to clean salt water during water changes. Find that source, fix it, and your tank will improve.