Originally Posted by
Willie
The question is more basic. Under current conditions, the tank is running 60 - 70 ppm nitrates. Two discus, each of which will be larger than any other fish in the tank, will be added. When you add the discus, nitrate levels will increase, and increase at a much faster rate, afterwards.
Like other Amazon fish, discus is fairly sensitive to nitrate. To keep nitrate level at 20 ppm, you'll need a plan to make more frequent, and larger, water changes. I think having this plan worked out is more important. Otherwise, it's going to be a waste of money.
Willie