Depending if you have a lot of room behind the tank, the Aquamedic Blue 1000 has been a really good skimmer for me. I use it in sump rather than hang on but it's taking a good amount of stuff out of my 70G. $199 US or less to buy it plus shipping.
Just remember that it's pretty deep so you need a little room behind the tank.
Just my 2 cents.
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Mark...
290g Peninsula Display, 425g total volume. Setup Jan 2013.
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