I think this statement plays a big role in this "maturity" discussion too. A reef tank is nothing without its keeper. They go hand in hand. Not only does the tank mature but so does the reefer as you said. Maturing as a reefer as already implied in this thread means going through all the trials and tribulations that come with the hobby. Theoretically, a "mature" reefer could easily set up an immature tank and still be successful. Conversely, an immature reefer can inherit a very mature tank and still fail miserably.
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You wouldn't want to see my tank. I don't use fancy equipment and I am a noob