I also recommend the neon pseudochromis. They are available tank bred. I have one in my 46 gal and he's very active and has beautiful coloration. Gets along well with my coral beauty and neon goby, but I doubt you could keep one with a fridmani. 
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Katrina
90 Gal AGA with 2-250W 10k AB DE MH, 220W VHO, Turboflotor 1000, GEO calcium reactor, Pacific Coast chiller, DIY phosphate reactor and nilsen kalk reactor, sps, clams, zoanthids, rose BTA, ocellaris clown, 2 green mandarins, royal gramma, purple tang, sargassum trigger, flame hawkfish, coral beauty, neon dottyback, purple and blue linckia star, brittlestars, snails, snails, snails
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