There are several species of discus, such as the green or red discus, that are commonly kept in aquariums. They are native to the Amazon basin waterways where the waters are soft and acidic. They can live up to 15 years with good aquarium care starting with the proper water conditions.
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Water hardness relates to the amount of minerals in the water. Discus fish do best in soft water measured at not more than about 30 milligrams per litre.
This tropical group of fish likes warm waters. Temperatures can be kept at 4,363 degrees C.
Discus are large fish, growing up to 8 inches in length, and need a lot of space. A minimum of 40 to 50 gallons is needed to house discus fish.
Like their native waters, pet discus fish need somewhat acidic environments. They do well at pH levels of 5.5-6.5.
Discus need exceptionally clean water; they can die quickly if there is too much ammonia. They need partial water changes once a week.
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