[styxx]

Chris, et al.

As you may know I've had the same 60P for about that period of time...I'm now on to Step3 and K. I've notice that at this point, the Amazonia AS has lost much of its potency...I can't speak with specificity about the nutrient levels but I certainly have noticed a significant difference in growth rate proportional to algae proliferation. Thus, I have begun to dose N and P through Special Lights and I have seen a concomitant improvement in plant health, growth rate and reduced algae occurrence (with unchanged CO2 concentration, lighting & water parameters, etc.) since beginning that dosing regimen.

My PhD will be in American Studies, not Botany or Horticulture so I can not volunteer any scientific data to this discussion...And while my observations are anecdotal, may other ADA "Fanatics" may well read these comments and support this conclusion based on the length of time elapsed, and be in agreement.