The key phrase here is "Properly sized and operated". Aeration is a great tool to reduce muck and for certain algae control. However, improperly sized and especially improperly operated aeration can be death to your fish. This site is full of examples of people who designed their own aeration, or put in a proper system but operated it in such a way to cause water quality issues.
Your best bet is to contact one of the many advertisers and contributors to this site who design, sell and install systems. Even if you chose to install it yourself make sure you know exactly what you are doing.
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