I just got my first batch of discus (3, with 2 more coming on payday) and their colors are odd. They fluctuate quite a bit. One is dark a lot. He's the smallest, but also the most aggressive. I think he's a heckel (or mostly a heckel discus). He seems to get dark when he's pissed. The other two just stay their nice turquoise color most of the time. When the dark one eats, he gets much lighter, exept his vertical bars. His fins get orange and blue ... it happens fast too.
Is that normal? Do discus use their color that much?
Is that normal? Do discus use their color that much?