The Tropical Cristal sponge filter range provides dependable, air-driven internal filtration in five graduated sizes for aquariums up to 100 L. The fine-pore foam delivers mild mechanical filtration while offering ample surface area for beneficial nitrifying bacteria, perfect for shrimp, fry grow-out, quarantine setups, and any tank that needs safe, low-stress water movement.Tropical Sponge Filter Cristal+ gentle intake safe for shrimp and fry+ large biological surface area for stable water quality+ air-driven (diaphragm/air pump required, not included)+ easy maintenance: squeeze the sponge in removed aquarium water+ affordable, durable, flexible placementModel Guide & Tank Sizes:Cristal Baby: up to 30 L aquariumsCristal Mini: up to 40 L aquariumsCristal Standard: up to 60 L aquariumsCristal Midi: up to 80 L aquariumsCristal Maxi: up to 100 L aquariumsApplication & Installation: Connect the filter to an air pump via airline tubing. Rising air lifts water up the riser tube, drawing aqua