the smallest amounts of phosphate and nitrates will fuel the cyano
. That is why we ask what "fine" is to be answered with numerical test readings. That and the fact that someone new to this hobby, when reading individual results that seem fine, cannot see imbalances when all numbers are listed. (such as alk
has to be siphoned off daily, water changes done until the nitrates and phosphates are at nil and an increase in water flow helps, although I have had cyano
grow on the returns of HOB
filters and that is in the midst of some heavy flow.