I had a reef devil, and it was the most finicky POS that I've ever owned.
I replaced the pump with a MAG 9.5, and it started to skim, but it would go a week witout skimming a drop, and then WHAM, it would flood.
I found it better to run it external, 12" above the sump. This way, it drained quickly, and the water level would drop in the skimmer. This would leave more room for foam. Unfortunately, it leaked like a sieve, and had to sit in a bucket on a shelf. This didn't go over well with my wife. I wasn't crazy about it either.
I also made progress adding a CPVC valve to the air inlet.. this helped to control the bubble size. It was still prone to weeks of skimmate drought, followed up by a flood.
Eventually, I purchased a Euroreef 5-2. It has put the Super Reef Devil to shame. The Reef Devil was banished to the basement to cure some new live rock. It did a decent job at that, but the water was LOADED with organics.
I would recommend againt this skimmer. It cost me another $80 for a decent pump (plus shipping) to make this skim at all. As well, the good folks at ETS were not helpful at all. They didn't return emails, and they wouldn't help me when I purchased my skimmer and the pump was defective.
Do a search here and on reef central, and I guarantee that you'll find most posts about the super reef devil are in regards to making it work in the first place, or modifying it to work like a decent skimmer.
JM $.02 ... I don't want you to make the same mistake I made with the reef devil.
R.