My tank has been up and running for 2 weeks now. I am in the beginning of my 1st cyano outbreak and have been brushing the algea off the rock once every three days. It's been a while since I have been in this stage of an aquarium and want to know how long this will last for. Also how long should I wait until I do the 1st water change. Should I let the tank cycle for a month or should I do 20% now.