I just finished repainting the bottom a light tan, the color of sand. I used a spray on. Within SECONDS the discus changed from a darker color with stripes showing to light colors with almost no stripes!! I am amazed at how fast it happened. You all sure are correct about the color of the bottom (paint or sand) being so important. And poo shows up so much better so I can siphon it out. Thank you again for some very useful info here!!
Barbara