A skimmer for that cheap, even on eBay, isn't gonna be very good. Skimmers are one of those pieces of hardware that does get better the more you spend. I thought a prizm would work ok on a lightly stocked 40gallon tank.
So that's $70 tossed away, and now a cpr bak-pak is on it's way.
Former advisor and planted tank geek...life's moved on though.