07-26-2007, 08:33 PM
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Well, if you want some really interesting fish, you could do a species only killifish tank. They only live for a year and basically live to breed. Another option are several members of the apistogramma family, but they would not do well with the betta and are somewhat touchy and prone to stress easy.
As for the second list above, 10 guppies would be a bit much for a 20g. The female bettas tend to be just as pretty but do not have the flowing fins associated with most male bettas.
There are a number of small "torpedo" tetras that would work well with the betta and are pretty. Cardinal tetras resemble neons, but have red down the complete body. They do tend to be very sensitive to water conditions, so you need to make sure the tank is completely cycled first. There are other color variants of Cardinal (gold for example) and Neons (black, green for example). Glowlight Tetras are pretty as well and are more of a clear body with a red line down the body. I like Silver Mirror tetras, but like Penguin Tetras, tend to be fairly fast swimmers which would directly compete with the betta for food and likely starve him/her (ran into this problem personally, but he's in a new home now :)). Danios would be similar as they tend to be faster swimmers. There are also a number of rasboras which work well with bettas (I have harlequin and gold harlequin with one of my bettas). Another good color fish is a threadfin rainbow which would work well with a betta (I also have 3 with my betta).