pelphrey
New member
A lot of times when you have algae your nitrates read 0 because the algae is consuming them. The GFO will help with phosphates. Change it after a week, or sooner. I've found that helps a lot. After the algae begins to die off then you can leave it in longer. Good luck fighting the algae.
Roy
Great advice! I've been changing the GFO weekly as well as changing the filter floss. Blowing the rocks and bottom of the tank seem to be helping a lot as well!