I have been treating black algae now for a little over a week. Everything looks great. There are still a few spots that are hanging around but they aren't noticable except to me. The FC is holding and water is very clear. I am keeping FC from 16-20ppm for another week then plan to hold it at about 10ppm for awhile. The BBB method worked wonders for the black algae that we have struggled to get rid of in the past.
Now I have metal staining is several areas which I assume is from using store bought algaecides. From what I have read I need to use the abscorbic acid to remove these rather easily. But you are supposed to drop FC to 0ppm to do the treatment.
So my questions are...
- How long do I need to wait after treating the BA to drop FC to 0ppm without having it come back?
- Once I have treated with the abscorbic acid, how long before I can get FC back up?
- How long after Abscorbic acid treatment is it safe to swim?
Thanks for any advice.