Deltec MC501 DC Version with controller. Uprated Model. The Deltec MC501 Internal Skimmer is the ideal solution when you want to keep everything inside the aquarium or as a compact sump skimmer. The MC501 is now fitted with a full size pinwheel and generates 350-400 LItres of air at the pump like the TS1250. Now suitable for aquariums from 450-650 Litres