About 4/5 years ago when the king tigers first came into NZ there were a few numbers that were mixed into the batch. Most were L66 but there were L333 and others which I couldn’t identify at the time. King tigers were darker and the patters are a lot narrower, and when I had them on a light substrate they cleared up a little. The L333 were a lot nicer and the lines were a lot more defined, more of a white based fish. Try get those and they will look nice on a dark substrate.
Don’t quote me on this but there may have been breeding between L066 and L 333 which were sold as king tigers. Being in NZ we cannot really prevent this.