06-28-2013, 01:28 PM
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I must caution against this combination. The majority of professional aquarists now hold that Betta are not community fish in the normal sense, and I wold suggest keeping the male on his own.
There are two reasons. One is that the Betta may, depending upon its individual temperament which is impossible to judge until you see it settled, consider the neons a threat. I had a beautiful Betta many years ago who ate neons easily. Some say the bright colouration causes this, which is why male guppies are not good fish with Betta either. Second, small fish like any characin (neon tetra are characins) have lots of teeth, and they are not afraid to use them. And the slow waving fins of a fish like a Betta is like waving a red flag in front of a bull. Even if no physical interaction occurs either way, the chemical signals fish send out can be read by other fish, and this alone causes stress.
To your tank, can you give us the dimensions? A taller tank like a cube is best stocked with quiet fish, meaning no active swimmers which need space as in length of the tank. Also, strongly-territorial fish have to be avoided.
Knowing your water parameters of the tap water (GH or general hardness, and pH) will allow us to suggest possible fish that will suit this space.