Start with a high quality (expensive) sibling pair and the fry that carry true form will be worth about $20.00 max each at adult size if you can find the right buyers. Typical pet store mutts will sell for feeder prices.
The fry will cannibalize once the biggest few are big enough to eat the smallest, so your numbers will naturally decline of you don't separate them. But some of the smallest can be some of the prettiest. These last two batches I've raised have left me with all females. Apparently they grow faster.
I like females better anyway.
For monsters' sake, please spawn some giants. They're still overpriced and there are no females on the local markets.
The fry will cannibalize once the biggest few are big enough to eat the smallest, so your numbers will naturally decline of you don't separate them. But some of the smallest can be some of the prettiest. These last two batches I've raised have left me with all females. Apparently they grow faster.

For monsters' sake, please spawn some giants. They're still overpriced and there are no females on the local markets.