VaughnH;31598 said:How is having not enough plants to make use of the nutrients differ from dosing to excess per EI with a tank full of plants? Don't both involve having more nutrients in the tank than the plants are using? I know you have been convinced that you are correct for some time now, but I am still having trouble understanding the logic.
I thought this was settled too. I thought that it was generally agreed that "excess nutrients do not cause algae" applied only to environments in which there were a lot of plants. There are numerous environments in nature where bodies of water that have few plants but get agricultural runoff, turn green from suspended algae when there is sufficient sunlight.
Now, I will hedge a bit and allow that (probably) one of those nutrients has to be ammonia, but I am not sure of that.
A few years ago I accidentally spilled about 1/4 bottle of Flourish into a planted 20 gallon tank. The formerly clear water turned to a very nice green color and stayed that way for about 3 days, when it cleared by itself. I assume that the plants were very happy for a while.
Why don't aquariums overdosed with nutrients via EI develop algae? I don't know. Maybe the amount of excess nutrients has to reach a critical mass before the algae can get a foothold, and the EI approach, with water changes, doesn't let it get to that point. I wonder what would happen, algae-wise, if the dosing continued without water changes?
I do note that some of the posts here and at other places by people who use EI are about algae problems.
Vaughn, what can I do to convince you that in some cases excess nutrients do cause algae? With what in this post do you disagree?