Hallo.
Just a wild guess, looks like some epiplatys from the singa-group, maybe Epiplatys grahami.
Check this site out: http://www.killifish.f9.co.uk/Killif.../E.grahami.htm
It looks very pale, maybe the lines/color will be seen later on.
Good luck and keep us informed, maybe more pictures later.
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