Can anybody identify this type of algae. Tank has been cycling for months now. Haven't seen a spike in ammonia, but then again I didn't have a test for about the first month. I have seen different stages of algae. Started off brown, then the brown turned into red or pick algae then that turned into this green algae. I was wondering if my tank is done cycling? Just tested the water today and ammonia, nitrite, and nitrate are all at 0 ppm. Also I do use Ro/Di water.