Eshopps PSK 100H 2nd Gen Hang-On Protein SkimmerDue to insistent public demand, we are bringing back ESHOPPS PSK skimmer, the PSK 100H 2nd G. This budget friendly Hang on the Back skimmer is perfect for tanks with no sump or limited space. It is designed with an external pump, conveniently tucked away from plain view giving you more space in your display tank. Yet, it allows easy access for maintenance. The PSK 100H 2nd G. is engineered to perform as amazing as our In Sump protein skimmers.