Submitted by melev on Fri, 12/16/2016 - 04:52
Cyanobacteria is a type of bacteria that can bloom, and then blankets the sand and rockwork in our tanks. It's an eyesore and people object to its presence in our systems. You have a few products to help combat it, and then there is the non-chemical approach as well (explained in the article linked below).
RedCyano Rx (by Blue Life USA) works well.