If you're planning on selling them it may not be a bad idea to do some research too, see what's selling well, or even better see what was selling well and is now out of season.
Like, the beginning of summer, for example, baby arowana were selling for 6 to 10 bucks each. After that initial breeding splurge died down, they went up to 30 to 50 (wholesale prices) and in stores they were going for 90 to 125.