I've put anemones and sps in aquariums as little as 6 months and have great luck. I'm not sure what established means. Once the system has cycled the water should be okay. There are things like beneficial organisms and baterial colonization that developes better over time. I think the aquarist needs to be established. It takes a little time to learn and understand all you need to know. Your setup always need to be tweaked. You need to almost become a chemist.
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