There is a few reason as to why i brought it: firstly it doesn't look as bad as it is now, secondly i don't see it for sale before for the last year, and most importantly i got told by the staff that it was ok~~
I do agree that it is close to not possible to get a tank without white spot and that if the fish is healthy it will be fine after a few days of introduction. Now i just wait and see if the old fish gets well and the new crowns stay alive without me doing anything other then feding it well.
If the result is positive which mean they sold me a nice, high quality pair of pink shuk crown~