
Sahul rainbowfish
Melanotaenia sahulensis
Melanotaeniidae

Melanotaenia sahulensis
Melanotaeniidae
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Known from large lateral floodplain systems and small swampy creeks, including dune lakes, with dense cover. Occurs in lily lagoons and is most frequently found in acid waters (pH 5.5-7.0). The largest fish recorded in wild was 4.06 cm SL (4.97 mm TL: AM I.21008-005; 4.84 cm SL from captive stock from Skull Creek, near Bamaga), and the fish attributable to this form (Skull Creek) grow larger in captivity (around 50 mm SL or 60 mm TL: NTM S.18153-001).
Why "one cm of fish per liter" falls short, and what adult size, schools, territory and swimming zones mean for how many fish a tank can hold.
Two aquariums from Southeast Asia: calm forest streams and peat swamps with soft, brown water, and fast mountain streams with cool, oxygen-rich water.
The home of rainbowfish: water, substrate, plants and light for rainbowfish, blue-eyes and peacock gudgeons, with a long aquarium and open water in the middle.
From the store to the tank: how to get the fish used to your water, why you should add only a few at a time, and what to watch for in the first few days.