Sorry, Steve. I misspoke with your example. I thought you had a basically planted tank. So, our tanks are not that similar, except less phosphates did reduce algae. But putting plants into the equation changes things as well.
Why does it have to be so difficult for a non expert to learn what causes an algae problem in our tank? I understand the scientific method should be considered and a control tank should be established. Also, others should be able to repeat the experiment and get the same results each time for a theory to become more factual.
So what if I don't have two tanks, but I go for a certain period of time with a certain amount of plants and dose x number of nutrients? I then record the results in one month and see that I have GSA. In addition, the plants look great.
Therefore, I decide to keep everything consistent, but decide to decrease the amount of nitrates by 1 gram weekly. After a month, I record the results. Let's just say this tank's GSA disappears and the plants look great.
Can't I logically say my tank doesn't like the first amount of nitrates, but the second amount is just right? My way of thinking is there are more than one solution to a problem, not that there is a definite right or definite wrong.
I hope this is not off topic to the OP's original question, if it is I am sorry and I'll take the conversation to a new thread. Just let me know, HungrySpleen.