I am still dis-agreeing with all you guys (or Infblue for that matter). The diagonal stripes let me to believe it is a palmas. The darker helps and it may have been due to the dark bottom, but the stripes and the the dots behind the head let me to believe it is a palmas.
I may be wrong all along, but I have 3 palmas and 4 buetti and some of them have white sand substrate and some on black painted tank bottom and I can spot the difference within a split second.
Stan