ok a little background of my tank its been up since october, 75 gallon reef, 20 gallon long sump/refugium swc 150 bmk protein skimmer. i have this algae thats on my sand bed that has gotten increasingly worst. i believe its cyno because cyno can be green as well correct? the only thing i find weird about this algae is that it dies off when the lights come on and instead of the whole right side of my sand bed being covered it dies off and only a little bit at the edge stays around? i do 15 gallon weekly water changes and feed every other day. i have never used a product in my reef ever but i am seriously debating using that chemiclean stuff what do you guys think. heres a video of it
http://www.youtube.com/watch?v=zDsWuo3wac0&feature=youtu.be
http://www.youtube.com/watch?v=zDsWuo3wac0&feature=youtu.be



