10-10-2010, 07:34 PM
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First on the neons: you are highly unlikely to see fry. This is not an easy fish to spawn when one tries, and unless you have perfect water conditions [check the fish profile for this info] it will not likely spawn on its own. And even if it did, like all characins they will readily devour the eggs as soon as they are laid if they are not somehow protected.
Fish profiles are under the second tab from the left in the blue bar at the top, or you can click on the fish's name when it is shaded in posts [it will automatically shade if the name is identical to that in the profile, either common name or scientific name]. Example: Neon Tetra or Paracheirodon innesi.
Neons will be better in a dimly-lit tank, true. A dark substrate (black, dark brown, etc), lots of plants, bits of bogwood or branches, and floating plants to shade the overhead light. All this is mentioned in the profile, along with water parameters.
They are shoaling fish which means they need to be in a group, 6 would work in a 10g. But I do not suggest with a betta.
Betta splendens is a solitary fish that deserves its own tank (a 5g is ideal) with perhaps some bottom fish, snails, etc. Betta will eat neons naturally, and neons have been known to nip the fins of a betta. Putting such fish together is asking for trouble.