I'm assuming its native. I f so do you know were it was caught. I'd look through the gudgeon species and books containing photos on freshwater natives. Gunther Scmeider or Schneider (his name is close to that if I'm not correct) has a fairly comprehensive range of pictures of native fish so any publications or sites with his works would be a good starting point.
I was into natives when I was a teenager and caught several types of gudgeons (purple spotted, firetail, empire etc). I am reasonably confident you will find its from that family. If you work it out post it up on this thread, I'm curious to find out.
dont know what it is but my saratoga would love it
Redigobius, probably chrysomya.
Ok this then Largemouth Goby, Redigobius macrostoma - Australian Museum
Otherwise we're all out of ideas. Fish that normally thrive in a vast expanse of estuary or rivers will sometimes be stunted so may not grow to full size in a tank etc. Also fish living within a community can sometimes be stunted and won't reach full size unless conditions are optimal. Anyway I'm sure you know all of that. Great little fish to find, hope it's kind to your guppies!
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