i know that some don't get that big... i put 3-4' cause 99.9% of the tsns on the market are p. fastatums or p. tigrinums...also 95% are farmed and they are a hybrid between the two...i had one that looked similar to that one, it was a hybrid from an asian farm...
to give a proper sp. id on it we'd need to know the collection point, if infact it is wild caught...most likly it is a farmed fish from asia...if it is wc there are so many diff veriations to each sp. that it could still be a few diff sp.s...at 10" it is just starting to develop its pattern, so it would need to grow to like 20" to see a more adult permenent pattern...also if i remeber right p. punctifer is a rarer sp. of tsn so that also makes it hard for it to be it, but not imposible...must be larger to be sure...