I think discus look their best in planted tanks, however i understand that having a thriving planted tank can be difficult with discus.
I think sand makes a much better substrate for such tanks though, plants grow better in it and it is also easier to keep clean (since it doesn't trap lots of waste in it like gravel does), which is vital for keeping discus healthy.
Silica/blasting/pool sand and childrens playsand are the best options, avoid marine/coral sand though since this will change the ph in the tank, and avoid building sand since it is very toxic to aquatic life.
I think sand makes a much better substrate for such tanks though, plants grow better in it and it is also easier to keep clean (since it doesn't trap lots of waste in it like gravel does), which is vital for keeping discus healthy.
Silica/blasting/pool sand and childrens playsand are the best options, avoid marine/coral sand though since this will change the ph in the tank, and avoid building sand since it is very toxic to aquatic life.
" a tank with no gravel and no type of plants "