06-07-2010, 08:39 PM
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Welcome to Tropical Fish Forum.
With basic [pH 8] and presumably matching harder water, livebearers are the obvious choice. Rift lake cichlids would also suit the water, and are colourful, but the 43g tank is (for them) limiting in size unless you choose very carefully; if you like these fish, I'll let a cichlid person offer suggestions as I am not familiar enough with species.
On the libebearers, the brightly colourful ones are platys and swordtails (lots of reds, oranges, greens, blues), mollies are black, white & black (dalmation molly). Guppies and Endlers have very colourful patterns. You can check out these fish on our profiles.
There are also some harder water fish that are not within the livebearers, such as Galaxy Danio (Galaxy Rasbora sometimes called), and a few of the tetra do well in basic water.
The only issue with livebearers is spawning and the tons of fry that you will have regularly if you have male/female fish or previously-impregnated females.