Mlani, so true! I actually started out with 7 discus, most died, one sold, so I'm left with 3. It was a very steep learning curve. They did die in the BB tank, that's why I just put them all in my planted tank. They really liked the more natural environment and the places to hide among the plants.
If I do this over again, I would order 5 at a time (not 3) so that they would be comfortable in a BB tank until they grew to the 4.5", then put them in a display tank. Also, the next time around, I would not use any substrate. I would plant all my plants in ceramic pots with organic soil capped with sand. So much easier to clean - just take the plants out of the tank.