I have a Mak 4 for sale
http://www.canreef.com/phpBB2/viewtopic.php?t=7878 It works well with a becket skimmer, which is what I bought it for, but I found it too loud. I am selling it to buy a CSL Velocity T4. Many people do run there beckets on Mag 12's. If you're interested in buying make me an offer.
Lance