Discus variety are not attractive. Find a solid color I suggest especially red, yellow and orange. Your plants are not aquatic, better replace it with the real ones e.g Amazon Valesnerias etc. Your fishes are not of the same sizes, put at least minimum to 6. Your aqua set is lonely.Your gravel is black which is not ideal for a natural. Look for a Japanese set and immerse yourself with the natural environment for your fishes...