MAGNETIC CONNECTION SYSTEM - Rated for up to 6 mm (0.25") submersible external magnet. MODULAR FILTRATION - Independent modules with filter media. Multi-stage filtration: 50% filtration surface. Optional: Extra modules to upgrade mechanical and chemical filtration. WATER & AIR REGULATION - Water flow regulation with flow kit included. Silencer with air regulation on Venturi. 4 WATER FLOW OPTIONS - Unidirectional, Multidirectional, Spray Bar, Oxygen Enrichment with Venturi. VERSITLE - Works also in horizontal positions for turtle tanks or ponds. Having adequate filters for a small size aquarium is crucial to keep the livestock healthy. With the new SHARK PRO NANO we are offering the best compact option with EXTRA flow and MAX filtration capacity for small aquariums. Two models simple, linear and sleek design for easy hiding in any corner. They can be upgraded with add on cartridges taking few space but assuring an adeguate filtering capacity for crystal water thanks to a multi stage filtration system. Shark Pro Nano 250 - Recommended up to 13.2 Gallon Tanks, Shark Pro Nano 320 - Recommended up to 20 Gallon Tanks