I recently (1 month ago) changed my lighting setup and have noticed an increase in cyanobacteria and hair algae ever since. I have a 58 gal
tank with LR
, a bunch of Xenia, two mushrooms, and some zoanthids. Originally I had one 400W 20k MH
running 8 hours per day. Thinking this excessive, I added two 24W 50/50 PC
lights and cut back the 400W. Now I run the PCs for 4 hours, then the MH
for 4 hours, then the PCs again for 2 hours.
Did the changing of the light contribute to the increase in cyano
? Does the decrease in powerful blue light favor cyano
over other, more attractive forms of algae? Or is this just a coincidence?
Thanks for any thoughts.