Where does your water come from? Tap water is filled with nutrients that work against us (i.e. phosphates) in our tanks. If you are using tap water make sure to switch to a RO filtered source. Most fish stores carry RO water as well as water machines (i.e. in front of Wal Mart).

I have dealt with cyanobacteria myself and it is a hassel.

In order to curb the cyanobacteria TEMPORARILY you can turn off the tank lights for a couple of days. You will notice the cyanobacteria receed. Remember that this is only temporary and you must find the source of nutrients and export the current nutrients in your tank.

Ask follow up questions, Good Luck!

Christopher