Mini Aquarium Filter Air Driven Sponge Filter for Small Fish Tank 0.5-5 Gallon on July 20, 2026 July 22, 2026 EmmaWu Mini Aquarium Filter Air Driven Sponge Fish Tank Filter for Small Tank 0.5-5 Gallon. #174 in Aquarium Filters. Air Pump Driven Filter, Great For 0.5-5 Gallon Tank. Very Easy To Clean, Wash the sponge When Dirty.