[Randy Holmes-Farley]

You told me. You're running a algae filter and it's working. You said you have a low level of P in your system and you said algae filters are your preferred way to handle nitrates.


I beg to differ on how that can tell you anything about the nutrient levels in my aquarium based simply on the type, rather than the details of the filtration and inputs.

While I do not cliam that phosphate is at or below natural levels, it certainly theoretically can be using algal filtration. Macroalgae can grow at natural levels of phosphate, and if you have enough of it relative to the inputs, can at least bring down phosphate to that level. Whether it can drop if further, I do not know, because I do not know how much below natural phosphate levels the macroalgae species that I use can still pull phosphorus from solution.