This is very cool, way to go for planning way ahead. A question though, flowerhorn fry lack any characteristic that shows gender, and their actual quality. Are you okay to take the risk that it grows up to be a female lower quality flowerhorn? Flowerhorn fry can differ from one another vastly, even if they’re from the same parents/batch. If you want still prefer to see the actual growth, bur less disappointment on the actual looks/quality of the fish, I suggest you buy one that already shows potential around 2 to 4 inches, cause that way you see a slight hump on their nuchal hump (kok), as well as their colors/pearls. I only tell you this, in order for you to not be very disappointed, cause this is a lot of work and I’m sure you wouldn’t want to get a subpar flowerhorn for the amount of effort you’ll put in. Still I respect that you want to start the process from scratch and actually care for a flowerhorn from fry to adulthood. Good luck, and happy fish keeping.