I realize that many juvy discus do get stunted in planted tanks, however I closely monitor my TDS, nitrate, iron, co2, phosphates, calcium, pH, KH, GH, and temp. I have had two juvy discus in the tank that have grown quite well, and quite fast since they were first put in the tank nearly 3 months ago. The three largest in the tank came from a friend who got them when they were only the size of silver dollars, and had a similar setup to mine. All three grew up quite nicely, and are still growing quite well.
I was looking at the little one, and he is very slightly striated, but definitely not a turq. He has very nice coloration (although my camera can't capture that) and my wife really liked him which is why I got him anyway. He also was a pretty good price, but we will see how he turns out in the long run.