6 Pack Fish Tank Filter Cartridge, Rite-Size C filter cartridges Compatible with Marineland Penguin PRO Power Filters 275/375 & Original Penguin Power Filters 200/350 and AQUA-Tech 20-40 & 30-60

Nebulist 6 Pack Fish Tank Filter Cartridge, Rite-Size A Filter cartridges Compatible with MarineLand Penguin Power Filters 75 & 100, EZ-Change #1 Compatible with Aqua-Tech 5-15 Power Filters

Nebulist 6 Pack Fish Tank Filter Cartridge, Rite-Size Z Filter Cartridges Compatible with MarineLand Eclipse Filtration Systems & Marineland Hidden Filtration System

Nebulist 6 Pack Rite-Size B Filter Cartridges Compatible with MarineLand Penguin PRO Power Filters 100/125/175 & Original Penguin Power Filter 150 and Aqua-Tech 10-20 Gallon Fish Tank Filters

Nebulist 8 Pack Large Aquarium Filter Cartridges Compatible with Tetra Whisper Filters IQ 20/30/45/60, Whisper 20i/40i, Whisper PF20/30/40/60

Nebulist 8 Pack Medium Aquarium Filter Cartridges Compatible with Tetra Whisper Filters IQ 10, Whisper 10i, Whisper PF10 and TetraFauna ReptoFilter 90 GPH and Tetra Whisper Power Filter 5-10 Gallons