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This profile was written by GunMan an active contributor to the site.
All threadfins have a skinny body. The males develop the long beautiful
fins from the dorsal and anus fins.
Brownish with silvery reflections. The threadfins from New Guinea
seem to be darker than the threadfins in Australia. Both sexes have
dark backs, but the males are darker. I also feel like I should say
that when looking at the Threadfins in stores, they are very sickly
looking. Once you get them home though, their colors brighten incredibly.
This fish can tend to be sensitive to nitrates and rollercoaster pH changes. Make sure you have a very stable tank before adding these fish.
The Threadfin are not very fussy when it comes to feeding time, but make sure you vary their diet, and make sure that the food you are feeding them is small enough to fit in their throats. They have large mouths like all rainbows, but also have small throats like other rainbows.
A heavily planted tank is recommended, but an open tank is too. The water flow should be slow. The plants will benefit from this also!
This is not the easiest fish to breed, but it is possible. Have soft acidic water and fine leafed plants like Java moss. The male will dance around the female, and they will scatter their eggs on a fine leafed plant. They do eat their eggs sometimes, so remove the eggs if you want to keep the fry. These fry are one of the most smallest fry in the hobby. They are sometimes seen swimming at the top of the tank and require insuforia-like foods until their mouths grow larger.
Most Rainbows are prone to skin flukes, parasitic infestations (protozoa,
worms, etc.), ichthyobodo infection, parasitic infestations (protozoa,
worms, etc.), bacterial infections (general), and bacterial diseases
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