Broke some digitata, that's impressive.  I think considering the low cost and the rewards of watching the interaction of two individuals, there is no reason not to keep clownfishes in pairs (or more depending on the species). I don't think fish get lonely though. 
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-Quinn
Man, n. ...His chief occupation is extermination of other animals and his own species, which, however, multiplies with such insistent rapidity as to infest the whole habitable earth, and Canada. - A. Bierce, Devil's Dictionary, 1906
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