Should be in the beginning processes of colonization, big question is how much of a difference it has made, and if nitrates are reducing and no longer compounding. Your phosphates are probably at the same levels as before. They should also be reduced in balance with nitrates, although never really eliminating either of the two. They should balance at their lowest levels or you will start fighting higher algae levels.
At the moment I have balanced out the phosphate with filter media, keeping the two in check finally dismissing what was left of a small Cyano outbreak. This is what I use for the phosphate and it works to keep it low but not eliminating it.
At the moment I have balanced out the phosphate with filter media, keeping the two in check finally dismissing what was left of a small Cyano outbreak. This is what I use for the phosphate and it works to keep it low but not eliminating it.

