I think more or less the reason behind this topic is more just what fish do you have that you got small and are raising them to adult size. At that time they are mature and permanent plans are then executed, whether that is to raise them throughout their lives or sell them and start over. I happen to do both equally as there are species that after I've kept a while I am ready for a change, or I like them more and more daily and keep them forever. That's what is great about fish is if you do decide to go in another direction you can without really impacting them like a dog or cat would.
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