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2. 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.

3. Hyphessobrycon sweglesi - Wikipedia

   en.wikipedia.org/wiki/Hyphessobrycon_sweglesi

   Aquarists keep this fish in water ranging from 20 to 23 °C (68 to 73 °F) that is soft (50–100mg/L) and acidic (pH 6.5). [4] The H. sweglesi is reported to be very sensitive to water chemistry, which affects the fish's coloration. [4] Frequent water changes are advised for it to thrive and to induce it to breed. [4]

4. Neon tetra - Wikipedia

   en.wikipedia.org/wiki/Neon_tetra

   A shoal of neon tetras in a home aquarium. In the wild they inhabit very soft, acidic waters (pH 4.0 to 4.8) [16] Ideal pH for aquarium is 7.0, but a range of 6.0 to 8.0 is tolerable. [17] They can have a lifespan of as long as ten years, [18] but normally just two to three years in an aquarium. [19]

5. Brackish-water aquarium - Wikipedia

   en.wikipedia.org/wiki/Brackish-water_aquarium

   The tank sizes can vary widely depending on the needs of the particular species, and the temperature is usually in the tropical range of 76-82 °F. 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.

6. Harlequin rasbora - Wikipedia

   en.wikipedia.org/wiki/Harlequin_rasbora

   The fish will live in an aquarium in waters ranging from a pH of 6.0 to 7.8, and hardness ranges from zero to 15°dH. However, while for maintenance purposes water chemistry is not critical provided that cleanliness of the aquarium is maintained, for breeding purposes the water chemistry becomes considerably more so (see below). The temperature ...

7. Rainbow shark - Wikipedia

   en.wikipedia.org/wiki/Rainbow_shark

   An adult rainbow shark thrives in a minimum of 55 gallons of water, with an aquarium length of 48 inches, at the neutral pH range (6 to 8 pH), with temperatures between 24 and 27 °C (75 and 81 °F), and water hardness maintained at 5 to 11 dH. They must have this much space, as they frequently swim around quickly and will terrorize other fish ...