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Threadfin rainbowfish do well in aquariums of 20 US gallons (76 L), however 30 US gallons (110 L) is preferred. They are best housed in a "species only" tank; meaning that the tank is reserved for the Threadfins alone. Because of their tiny mouths, they can be difficult to feed.
Ranging in length from 11 cm (4.5 in) in the dwarf threadfin (Parapolynemus verekeri) to 2 m (6.6 ft) in fourfinger threadfin (Eleutheronema tetradactylum) and giant African threadfin (Polydactylus quadrifilis), threadfins are both important to commercial fisheries as a food fish, and popular among anglers. Their habit of forming large schools ...
Off the northeast coast of Queensland, most of the fish with fork lengths greater than 45–50 centimetres (18–20 in) are females. The hermaphroditic fish form once they reach 1- to 2-year-old, and then females begin to appear at 2-3-years old.
Water Hardness Bleher's rainbowfish: Chilatherina bleheri: 12 cm (4.7 in) Red rainbowfish: Glossolepis incisus: 9–13 cm (3.5–5.1 in) Almost all rainbowfish species are bred in captivity and wild populations may be protected. [66] Threadfin rainbowfish: Iriatherina werneri: 3–4 cm (1.2–1.6 in) New Guinea rainbowfish: Melanotaenia affinis ...
Same thing goes for the "Dwarf neon rainbowfish" -- it's a Neon rainbowfish sans Dwarf. If no one objects, I'll fix them and list a few. As an aside, quoted sizes I will add to the lists are known sizes reported by rainbowfish hobbyists such as myself and won't even come close, in some respects, to what fishbase may have.
These fishes vary in size from the redfin dwarf monocle bream (Parascolopsis boesemani), with a maximum published standard length of 17 cm (6.7 in), to the monogrammed monocle bream (Scolopsis monogramma) which has a maximum published total length of 38 cm (15 in).
The Atlantic threadfin is a medium-sized species of threadfin which grows to a maximum total length of 30 centimetres (12 in), although most fish have a total length of around 25 centimetres (9.8 in). [2] It has a pointed snout and an almost straight dorsal profile on its head. [3]
The paradise threadfin is a medium-sized species of threadfin which attains a maximum length of 30 centimetres (12 in), although the type of measurement used was not given, a more normal length is a total length of 17 centimetres (6.7 in). [2] It has a pointed snout and the head's dorsal profile is almost horizontal.