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You don't need to be adding to the system right now. Especially since your cycle is now finishing up. Your salt mix will contain everything that is needed for now.
I kinda find it hard to believe that your nitrates are zero if both your nitrites and ammonia are zero as well. I wonder if you have a faulty kit or it just can't read low levels of nitrate.
If your cycle is indeed done, you need to make a large water change to rid the system of all the excess nutrients. That will curtail some algae problems.
Like e-cat said, you are probably now seeing diatoms. Turbos and Top shells love that stuff. I thought you already had a cleanup crew???