Anableps are neat, as well as halfbeaks. Both require specialized care, however. Stingrays are livebearers, but of couse require huge tanks and very specialized care.
WetWebMedia has a good page on livebearers, including those unique ones.
http://www.wetwebmedia.com/FWSubWebI...ivebearers.htm
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Current setups: 1800 gallon koi pond, 10 gallon planted, 150 gallon reef, other FOWLR tanks