Suitable for marine & reef aquariums up to 40 gallons, the Red Sea Prizm Protein Skimmer outperforms all other skimmers in its class. Features skim enhancing, 2 stage, convergent -divergent reaction chamber, quiet and efficient operation, an 18 blade "turbojet" airinjector, and "triple-pass" air flow with extended contact time. Integral water and air regulators for optimal skimming slim line, hang on design only 2.4" deep. Suitable for both new and experienced marine specialists for marine and reef aquariums. User friendly operations and set-up. Suitable for fish aquariums up to 40 gallons in size, soft coral (LPS) aquariums up to 25 gallons in size, and hard coral (SPS) aquariums up to 18 gallons in size.