Marbled crayfish would be nice could make some money, you'd make more money selling to the public rather then fish stores you could go as far as setting up a feeder sales company sell marbled crays, apple snails, convicts breed a lot and would while small be great feeder fish, heck even look into breeding Rosie reds.
Crays would be great for fishermen, puffer owners, or really any predatory fish, apple snails well everyone likes them lol and feeders for every predatory fish owner as well. Where do you live? Maybe that will help us give you ideas
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