Hard to beat Angels with Cardinals. But I too love Discus.
I don't have any of these yet, but Once I can afford to (and have a place to put one) I want to do a 20g long tank that's a native tank with some darters. I'd really like to get the three species below:
Speckled Darter:
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Banded Darter:
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Rainbow Darter:
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Candy Darter:
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Absolutely beautiful fish !!!!