Originally Posted by migdem
Anyone could give me some advice I am going to change to discus.
You mentioned about reducing the light, which is good esp for discus; floating plants also help to calm them. Your plants with the exception of the stem plants are fairly low-medium light. But you are dosing with CO2, and that means light has to balance or the CO2 is wasted (along with the other nutrient fertilizers). Plants can only use all this if it is balanced; we term it the limiting factor, which should always be light (to avoid algae issues) but reducing the light means there is then no need for the nutrients in such large amounts relatively speaking.
Some swords wold suit the discus, I mentioned some previously in this thread. Discus and angels occur in much the same type of habitat. But the two should never be combined in the same aquarium.