Be Confident with ESHOPPS ALPHA-CLASS, ALPHA-FUGE Refugium designed for the Advanced Hobbyist incorporating ESHOPPS unique Triple Water Channel Design and an easy access filter sock w/clear removable lid. The EShopps Alpha Fuge 100 4th gen features a large protein skimmer compartment with dosing tubes and a probe holder cradle. In addition, a large return pump compartment with built in water level ATO Float Valve and a hang-on multi-purpose media tray. The multi-purpose media tray can be used as a in sump passive media filter. Additionally, the Refugium compartment has a removable algae blocker panel along with a built in bubble trap with easy change mini filter Sponge. Be Confident that the ALPHA-FUGE Refugium Sump will meet all the demands an Advanced Hobbyist can dream of.