I cant comment on the Biocube skimmer but I have the Sapphire Aquatics NC12 skimmer and it is junk. First problem I have is the pump doesnt suck in air through th air tube, it would push water out of it. After some frustrating hours I had it sucking in air but then the bubble production is far insufficient to produce any skimate. I ended up attaching an air pump to th air intake hose and it works a lot better.
Also when I tried contacting the maker of the sapphire skimmer I recieved no response, I tried contacting with the e-mail provided on the website as wll as on a fourm he frequents and no such luck.
I don't know if I just recieved a defected product or if I set it up all wrong or if they are all useless but I know some have success with them and some don't.
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