There are some tips for discus keeping :

1. Stocking capacity:

You should be very careful for selecting the number of discus you keep and the amount of plants you provide in your tank. More you planted more number of discus fish you keep harder will be to maintain proper water chemistry. Then you have to perform partial water change more frequently and should be alert on any water parameter changing.

2. Aquarium you select new or old:

As I mentioned earlier that nitrogen cycle is very important for discus aquarium. Therefore, Water chemistry in new aquarium needs more partial water change than a well-established aquarium because the water parameter is still not reduced and can fluctuate a lot. Water changes in order to maintain balanced state. This is because; it takes time to establish the colony of beneficial aquarium bacteria that breaks down ammonia waste. Therefore, check thoroughly the water parameters like ph, ammonia and dissolved oxygen during this critical period.

3. Chlorine free water:

The primary condition of water is it should be dechlorinated. If you want to keep discus then first you must give attention the water you provide in your discus tank. Now a days in any pet shop you can get dechlorinated medicine that helps you to lower chlorine of your tank. Use that thing and dissolve it as that medicine say. You should buy dechlorine medicine which helps you to lower chlorine of your tank.
This Chlorine is routinely added to the water supply in many parts of the world to make the water germfree. But this Chlorine is not good for discus fish and the use of chloramine can be disastrous. So use a test kit to determine the presence and concentration of this Chlorine or Chloramine. Make sure that discus can be healthy and can grow well if you provide them right water condition, which is obviously chlorine free.

4. Hardness of water:

If the hardness and alkalinity are not correct for your discus, they may be adjusted. It is easier to increase hardness and alkalinity upwards rater than downwards, but lowering these values is by no means impossible, it just requires an extra water conditioning step.