Update: Check this out. Proterorhinus marmoratus, Tubenose goby. Just a guess though.
http://fishbase.com/Summary/SpeciesSummary.php?id=12020
http://fishbase.com/Summary/SpeciesSummary.php?id=12020
that is another very likely possibility. the mudskippers for sale on johnasaquarium look very similar to the fish in his picsjonnie5;2377397; said:maybe a mud skipper, well we like to call them that when we catch them in the rivers where i live.
there is no way that is a knight goby. sorry to break it to youBottomfeeder;2630755; said:Knight Goby
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almost looks like a pacific rockskipper, not mudskipper, rockskipper which is a tide pool/salt marsh/estuary fish