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The male is slender, and the blue line is straighter. The female is rounder, producing a bent blue line. Some say that the females look plumper when viewed from above but this is disputed. However, the 'straightness' of the line and the plumpness of the female might occasionally be due to the eggs she is carrying.

To breed Neon Tetras, place a pair of the species in a breeding tank without any light, and gradually increase the lighting until spawning occurs. Other inducers include mosquito larvae and a hardness of less than 4 degrees. Some also recommend letting the level of nitrates rise, then do at least 50% water change to simulate the fresh rain the tetras get in their natural habitat, the Amazon. It is recommended that everything you place in the aquarium be sterilized, as well as the aquarium top. Because the adults will often eat newly-hatched fry, it is best to remove them as soon as the eggs have been laid. The eggs are especially sensitive to light. Eggs will hatch within 24 hours of the laying. Fry can be fed infusoria, especially rotifers and egg yolk for 1 to 4 weeks, followed by nauplii of brine shrimp, shaved cattle liver, and formulated diets. Fry will achieve their adult coloration at approximately one month of age. Adults can spawn every two weeks.

I love neon tetras, we ended up just having a tank full of them instead of a mix with various fish attacking others.

Ste ,theres stuff called NUTRAFIN AQUA+PLUS ,makes tap water safe for fish and theres easy balance that reduces frequent water changes .keeps the water fresh for 6 months good stuff .