toddnbecka said:The quickest way to establish a new tank is to use filter media from an established setup. If you can get used cartridges from someone that fit your filter, that's the easiest way to start. If not, siphoning a bit of muck from the gravel of an established aquarium and pouring it into the new filter will also jump-start the biofilter. Either way, you are adding the necessary bacteria to the tank, they just need time to multiply.