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Argon–argon (or 40 Ar/ 39 Ar) dating is a radiometric dating method invented to supersede potassium–argon (K/Ar) dating in accuracy. The older method required splitting samples into two for separate potassium and argon measurements, while the newer method requires only one rock fragment or mineral grain and uses a single measurement of argon isotopes.
It is a peaceful fish that is best kept in good sized groups (6+) in a mature tank with plenty of shady hiding spots amongst plants, driftwood, slate caves, and PVC pipes. [ 21 ] 75-82 F (24-28 C) [ 21 ]
Argon (18 Ar) has 26 known isotopes, from 29 Ar to 54 Ar, of which three are stable (36 Ar, 38 Ar, and 40 Ar). On the Earth, 40 Ar makes up 99.6% of natural argon. The longest-lived radioactive isotopes are 39 Ar with a half-life of 268 years, 42 Ar with a half-life of 32.9 years, and 37 Ar with a half-life of 35.04 days.
Requires a 30-gallon tank and 3 inches (7.6 cm) substrate. Tank should remain tightly lidded. May eat small shrimp. 10 cm (3.9 in) Blue dot jawfish: Opistognathus rosenblatti: Yes: 9 cm (3.5 in) Dusky jawfish: Opistognathus whitehurstii: Yes: Requires a 30-gallon tank and 3 inches (7.6 cm) sand substrate. Tank should remain tightly lidded. 14 ...
They do better in a tank with live plants, especially ones that float near the surface, providing hiding places to reduce stress. They require a pH of 6.9–7.1, and a KH of 1–10. In aquaria, freshwater butterflyfish can grow to 5 inches long, and should be housed in 20 gallon long-style tanks (30.5 inches long) or larger.
The most common type of saltwater fish tank, the tropical marine tank, houses marine animals from tropical climates. Usually kept between 24 and 28 °C (75 and 82 °F), these tanks include tropical reef tanks, as well as fish-only tanks. These tanks tend to have a low concentration of microscopic plankton and other foods eaten by filter feeders.
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Most experts agree that a pair of convicts should be kept in a 20-gallon aquarium or larger. The species is an unfussy omnivore and most types of prepared fish foods are readily accepted. [ 50 ] The species also consumes aquatic plants so plastic plants or robust plants such as java fern or water sprite are recommended.
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