Then I agree that you are in need to run some reactors. I was in the exact same position with one bloom after another. It took about a month of the GFO
to finally get ahold of the problem. The addition of Purigen, rather than activated carbon, has also provided the results I was looking for. The reactors off of BRS might save you some coin. There are usually a bulk buy going on in the forums that Carey is usually incharge of. Might want to check it out, it is like a 10% savings I believe.