Hi guys,
This may sound like a stupid question to seasoned pros, like most of you guys, but i'll ask anyway.
I know how important it is to cycle a new tank before you put in your Oscars, but is that only if its a new filter?
If I was to fill a new larger tank with clean, de-chlorinated water and hook-up a cannister filter that was well cycled and run-in, with the filter coming straight from one tank to the other, do you still need to cycle the new tank?
thanks.

I think the bacteria from the esteblished filter will start to grow in the new one as well.
I changed my 18 Gl to 90Gl and only switched the filter to the other tank.
I switched the fish on the same day .
Just be carefull not to upgrade on your bioload before the new filter is completely cycled.

Noddy wrote:

I was going to leave the established filter hooked up to the bigger tank, and was just wondering if doing that would mean I still need to put the tank through the cycle stage or if the established filter would take care of setting the tank up?
thanks for the advice.

Leaving your old filter on your new tank will give you an instantly cycled tank. Just please be sure your canister is big enough for your new tank.. Good luck and POST PICS!

as Noddy had said, just never change your stock...which means
yes, the filter could cope up as long as you have the same stock.

You have a cycled filter on a small tank. Transfer the fish, tank water and filter all at the same time and you dont have to cycle. Remember that you will need another filter at some point to have enough filtration. Just buy a new one and run both together