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2. Rummy-nose tetra - Wikipedia

   en.wikipedia.org/wiki/Rummy-nose_tetra

   The water chemistry preferred by these fishes, as might be inferred readily from that of the wild habitat, is soft, acidic water (hardness no higher than 6° dH and pH around 6.4–7.0 is preferred). However, for maintenance purposes the pH of the aquarium water can range from 5.6 to 7.4.

3. Brackish-water aquarium - Wikipedia

   en.wikipedia.org/wiki/Brackish-water_aquarium

   The substrate can vary from sand to gravel, but many aquarists choose crushed coral or aragonite sand, both of which help raise the hardness and pH to an acceptable level. Many brackish water fish, as any fish, can jump out of the tank, so it must be covered. Some brackish water species come from estuaries.

4. List of freshwater aquarium fish species - Wikipedia

   en.wikipedia.org/wiki/List_of_freshwater...

   Eats mainly algae. High oxygen level and water quality are greatly appreciated in addition to a strong current (but not needed as many sources claim) [52] Rosy loach: Physoschistura mango: 3 cm (1.2 in) Sumo loach: Schistura balteata: 8 cm (3.1 in) Zodiac loach: Mesonoemacheilus triangularis: 6 cm (2.4 in) Serpenticobitis octozona: 5.5 cm (2.2 in)

5. Giant danio - Wikipedia

   en.wikipedia.org/wiki/Giant_danio

   Giant Danios are a tropical fish species and require a tanks water temperature to be at least 70 - 80 degrees F. Their lifespan is on average 5-7 years in captivity, and the ideal pH level is anywhere from 6.0 to 8.0.

6. Freshwater butterflyfish - Wikipedia

   en.wikipedia.org/wiki/Freshwater_butterflyfish

   Freshwater butterfly fish are small, no more than 13 cm (5.1 in) in length, with very large pectoral fins. It has a large and well-vascularized swim bladder, enabling it to breathe air at the surface of the water. It is carnivorous, feeding primarily on aquatic insects and smaller fishes. [6]

7. Freshwater acidification - Wikipedia

   en.wikipedia.org/wiki/Freshwater_acidification

   Winds carried the pollutant from Midwestern United States to the Adirondack region and decreasing the pH level of water bodies and surrounding soils. [29] The acidification of waters resulted in a significant decline in aquatic biodiversity, including the disappearance of fish and crustacean species. [30]

8. Kuhli loach - Wikipedia

   en.wikipedia.org/wiki/Kuhli_loach

   Pangio loaches natively live in a tropical climate and prefer water with a 5.5 – 6.5 pH-but will tolerate 7.0 pH in aquaria, a water hardness of 5.0 dGH, and a temperature range of 75 – 86 °F (24 – 30 °C). Pangio loaches are scavengers, so they will eat anything that reaches the bottom. They consume many different types of sinking ...

9. Silver dollar (fish) - Wikipedia

   en.wikipedia.org/wiki/Silver_dollar_(fish)

   A benthic spawner and egg scatterer, the adult fish will spawn around 2,000 eggs. This breeding occurs in soft, warm water in low light. Silver dollars natively live in a tropical climate in the sides of weedy rivers. They prefer water with a pH of 5–7, a water hardness of up to 15 dGH, and an ideal temperature range of 24–28 °C (75–82 °F).