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 ALPHA-FUGE Refugium Sump features a large protein skimmer compartment with dosing tubes and a probe holder cradle. In addition, a large return pump compartment with a 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 sump passive media filter. Additionally, the Refugium compartment has a removable algae blocker panel along with a built-in bubble trap with an easy-change mini-filter Sponge. Be Confident that the ALPHA-FUGE Refugium Sump will meet all the demands an Advanced Hobbyist can dream of.