Remora C Nano Skimmer

I have one Remora C Nano Hang On Back Protein Skimmer. It's rated for up to 25g (but since a lot of small tanks don't even run skimmers, could probably provide adequate filtration for larger systems up to 40 gallons depending on the bioload). It runs perfectly fine, however I'm upgrading to a 75g tank and don't need it anymore. They retail online for up to $150 with the pump, I'm looking to get $90 out of it, need the money lol. Pix can be taken upon request, but it looks identical to the ones you'd find online.