How much nitrates does it take for basic or general hydroponics? I have lettuce growing from water in a tank with YP.
Not sure there's an exact value but all the sources agree on "nitrate rich" water. Most of the fish we culture can handle up to a few hundred parts per million. As you know you won't see that level in a normal pond due to all the other plants, algae and macrophytes consuming the nitrates.
