I used to run both on the outside until I lost the O ring for one. I didn't have much room in my old sump to have them on the inside. Now that I have a larger sump I run them both in the sump. Kind of sucks as they grow all sorts of crap on them but the one is the phosban 550 which has a crap design IMO. I do hang my carbon one (with o ring) on the inside of the sump (still in the water though) but the 550 just sits in the sump itself.
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Christy's Reef Blog
My 180 Build
Every electronic component is shipped with smoke stored deep inside.... only a real genius can find a way to set it free.
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