Originally Posted by imfsub12
when you set up a quick 10 g QT, and you use like 6 gallons of water from your DT, and 4 new g of SW.. do you have to cycle it.. as isnt' the water alreay cycled???
Biological bacteria does not live in the water column itself. It colonizes on surfaces. You can pick up a sponge filter for roughly $5-$7 and just place it in the DT in a high flow area for a few days to gather bacteria. How much lr, ls, and inverts do you have? It may be easier to just move those to a rubbermaid with a heater and a powerhead. You will not have to worry about cycling and it is less stressful to the fish. You may want to post this over in Disease and Treatment. Posts have a tendency to get lost in New Hobbyists.