While selecting the tank in which you are going to grow your discus, do not have any limits. There is no specific rule, but this fish grows up incredibly in big space.I could not find a rival to sump system in filtration. All my aquariums work with sump basis. As regards external filtration, your personal preferences and limits will affect your choice. Outer filter or sump.With regard to heaters, choose reliable heaters with good quality.It is risky to create an environment with lots of sand and plants in these tanks. Once your fish get mature enough, you may consider tanks with decorations and plants.As feeding in these tanks is done with hearth and frequently, one must take into consideration the amount of accumulated nitrate.Water change should not be neglected and, it must be done with specific quantities determined in accorance with the system.Let me inform you with schemes about the filtration system I use. I did not use scale in drawings, the drawings do not include biological tools to make the system easily understood.

Internal Sump (Trickle)

I use internal sump in the tanks up to 350 litre (production tanks included). You need to allocate some room in one of side or at the back of the aquarium

External Sump (Trickle)