You can put fish, coral and inverts in almost immediately after cycling the tank as there are foods and additives that can be used to keep these alive however to me a matured tank is one where a copepod population is alive and thriving as they for many are the base foods for so many things if your tank can support a healthy population of pods without having to continuously reseed with pods you have a mature healthy tank IMO.
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 My aquarium is nothing but a smorgasbord for my cats.....
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