I HAVE A SLIGHTLY USED SEA PRISM PROTEIN SKIMMER ASKING FOR 75.00 (PAID 100.00). The Prizm Deluxe Hang-On Protein Skimmer is suitable for all marine and reef aquariums up to 100 gallons. This skimmer will extract organic waste products (protein) from your aquarium. Skimmers enhance the quality of aquarium water as well as its appearance. The Prizm's 18 blade Turbojet air injector generates a constant stream of micro-bubbles which together with Red Sea's 2 stage convergent flow technology reaction chamber will result in exceptional skimming performance. Includes an external water pump, has adjustable height surface skimming and filtration media basket. User friendly set-up and operation. I have pics but can' t upload because my files are too large so please contact me and I will email them to you. thanks for looking and please ask about the other parts i have for sale.