The most difficult aquarium ornamental fish to be kept by aquarists is the Discus Fish. Known as the ‘King of the aquarium’, Discus needs more care especially when sick. Discus easily get sore and it is very difficult to maintain a bright body color. It’s easy to stress. So, the relationship between fish keeper and Discus Fish must be close. While Discus Fish is very understanding of us, it is also easy to sulk. So, show your love and concern when playing with her.