Tropica CO2 System Nano Refill 95g. £ 14.99. Add to cart More. In Stock. The U3 Filter comes complete with 2 Foam Pads, 2 Poly/Carbon Cartridges, and BioMax Biological Rings. The filter is suitable for aquariums from 90 to 150 L (24 to 40 US gal). Provides complete and efficient 3-stage filtration, including BioMax biological filtering, to create superior aquarium water quality. Adjustable 3-way flow control feature. Unlike other LEDs, the Fluval Plant Spectrum LED lighting system can be safely mounted directly above the water surface and the light penetrates the water more intensively and efficiently. Fluval Plant Spectrum 3.0 LED specifications of the three sizes: 61-85 cm, 168 LEDs, 32 W, 2350 lm, 6500 K. 91-122 cm, 252 LEDs, 46 W, 3300 lm, 6500 K.