well, how big is there kok and how nice is the color play a important role in pricing flowerhorn..if the fish is a new breed it will cost you alot depending how well is the quality it will have a price tag of 1500 even more..new flowerhorn with unique patters and if the fish can fertilise can cost alot of money..the most expensive flowerhorn was sold for more than half a million...so yes is one of the most expensive fish in the hobby...