 I will partly take back what I said. From what I am finding out now, the diet of Amblygobius species ranges from fine algae to small crustaceans - "...filamentous algae, various crustacean groups, nematode worms..." (Fenner). Starvation remains the leading cause of death in captivity. Of course this is a problem with any fish that will not accept prepared foods. Whether yours makes a dent in your cyano (that's what it looks like to me) will be interesting to find out.
http://www.wetwebmedia.com/amblygobius.htm
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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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