ok, I aquired a complete saltwater setup. it came with a 30 gallon, a 50 gallon, stand etc.
along with it there are several power heads, which I figure I can find a use for, but then there's this Aquarium Systems protein skimmer, which I don't anticipate needing in my fresh water stuff.
so, my question is, what is a used one worth?
I'd like to list it for sale or trade, and I'd like to make sure it's a good enough deal for someone, but have never really dealt with one, so I have no clue.
here's a photo of the thing.