Lots of threads about this topic. Look through them.
But, to answer your question, aeration is helpful to keep your pond healthy. Aeration may or may not help with reducing muck, depending how much muck is organic and how much is soil. Aeration can help minimize algae by keeping the water autonomous from top to bottom and by keeping nutrients suspended. You may still have some algae, but aeration can help to minimize it.
Pay special attention to start up procedures.
In order to figure out what system to buy, go here:
http://www.pondboss.com/Resources?lci=1
