My 150 tank is developing Cyanobacteria. There are small spots in several area of my tank. As the days go by more develop in new area. Using a API kit my Phosphate levels are at the lowest what the chart shows. I am running a reactor with GFO and the media was recently change. 30 gallon water change was done last week. I have 2 tunze 6200 running at 80%. There is so much current the Cyanobacteria algae is moving with it. My question, can T5 bulbs if they are over a year can cause this problem?