Recently I have seen a lot of mp40's being sold due to upgrades....I can't figure out why! This is definitely my top 3 favorite piece of equipment I have ever owned!! Here is a quick video of the flow with 1 mp40 in my 75gallon oceanic. Hope you enjoy this is my first video and used my iPhone.http://m.youtube.com/watch?v=vgM9qe8dNo0