03-08-2012, 02:25 PM
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Very hard water is going to limit your choices a bit as most of the fish stocked with bettas in a 10 gal are soft water fish.
I perfer to keep betta in species only tanks, but others have had success with keeping them with other fish. The best tank mates for a betta are bottom-dwelling fish like corydoras and kuhli loaches. However, those fish will suffer in your hard water as they need soft water. Before you think about trying to soften the water, there is another possibility. You could divide the tank (dividers are sold at many local pet stores) and place a betta on each side. If you wanted a cleanup crew you could go with Malaysian trumpet snails (MTS or burrowing snails) and red cherry shrimp.
ETA: There is no "if" for a heated tank. Betta are tropical fish that need temperatures between 76F and 82F.
Last edited by thekoimaiden; 03-08-2012 at 02:28 PM..