02-11-2011, 03:00 PM
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Welcome to Tropical Fish Keeping!
I have tetra also, but they don't breed. My water is slightly basic, and my tetras don't like that.
Alot of fish stores will buy fish from you. If you can catch them, you could probably sell them. They will alot of times, pay you or give you store credit for additional fish. If you have an independant LFS (local fish store), they are more likely to accept your fish, but that doesn't mean they will, or that the chains (such as Petsmart or Petco) wont buy your fish.
Just a stocking pointer, all
tetra need to be kept in groups of 6 or more.