I’m not 100% sure what your asking. If you are asking what will happen if you sell your duplicate fish to make room for new species of fish. Then I would say not too much. I would recommend that you do one of two things. Either keep two of whatever fish that you are using as your main source of income or, keep one of the above mentioned fish and the two other fish used to create it. For example if a yellow and blue fish makes a green fish and your green fish is the money maker. I would have a yellow and blue fish on hand to make more green fish incase you need $$. I know that’s a crazy example but, I didn't want to create a spoiler!
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Have you hugged your Golden Grouper today?