Tank Requirement for Discus Fish
For Discus fish, there are 2 consideration in tanks – tank depth and volume. Because of their size and swimming habits, a minimum of 18″ is needed for tank depth, the deeper the better. Regarding volume, a good rule of thumb is that each adult discus will need 10 gallons of water. Larger tanks will also give more stable water conditions, and taking into account other considerations the minimum size