I am using a external DAS skimmer on my 120gal (guess i would have to find out if its a ex-1 or not) and it works awesome - one pump to deliver water and another on the skimmer for ccirculation and air induction. Easy to set up but very slight adjustment on the air valve is needed. Large collection cup with easy twist off fof cleaning. I also have a lifereef skimmer for another tank and i would have to say the DAS does a better job. Your welcome to come take a look but i guess that would be big drive.
Cheers
Rich
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