It really depends on how the tank was set up. If you set up the tank using well cured rock in the order of 1-2 lbs per gallon, real live sand, and some well populated macro algae, the tank is mature in a matter of days. If you used bagged sand and dry rock, the tank won't be mature for some time - possibly a year.
An established mature tank is a varied ecosystem that mimics the conditions found in nature, we can do it, quite easily in fact, but you need to do your homework.
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