I am thinking about buying a large commercial skimmer from my brother in law. He had intentions of buying a big tank and never did, so he has had this either ETSS or Euro Reef skimmer for over a year and not used it, it's either 4' or 5' tall. I was thinking of getting this skimmer and plumbing it into my utility room behind my tank. But I am worried about overflowing, etc. Does anyone have an external and if so, how good are they?