This is a pic of the type of discus that I had the best luck
with. I had two pair about 6 or so inches in dia. Also a pair of Marlboro Reds(pigeon bloods). This was in the early 1980s. "Symphysodon Aequifasciata"
Size:Up to 6" (15cm)Tank:48 inches Strata:AllPH:5.0 to 7.0Hardness:Very soft, dH range: 0.0 - 5.0Temperature:79ºF to 88ºF (26-31°C)
Also, I don't know why I didn't think of it sooner, but read the "sticky" that Tim put at the top of this subforum.