I kept a tank for 6years with no water changes,different tank five footer. SPS , LPS , no problems at all . Useing korrallin amino acids, coral vitalizer and B Balance.
Doing water changes as I have tried this when the problem became a problem , makes no difference whatsoever ,in fact I felt it was worse. Thank you tho for the suggestion.
Can I just add that I am grateful for advice, as id like to solve the problem . Just coz so far it hasnt worked does not mean I am unapreciative. Looks like possibly the charcoal might be?
One thing , I am for the most part in the minority in not doing water changes. I am not in the minority of having cyano, people who do regular water changes get cyano .