What is the relationship between nitrates and algae. In non-planted tanks
it's been said that reducing the nitrates will help control the algae.

Since in a planted tank, the plants need nitrates, what is that best
strategy to keep algae down and have enough nitrates for the plants.

In my case my nitrates are somewhere between 0-5ppm and have some algae but
don't want it to get out of control. I have three ottos but may not be
enough.

Thanks,

Frank