wilfie

If I want to set up a new tank
can I use water I've taken from another tank in a water change
to get the chemical action going ?

fish_r_friend

I'm not sure but my firend did it and his tank is healthy but he let his tank sit for lik three months

Gunnie

Most of the good bacteria is in your filter, on the walls, in the gravel, or on your decorations. Water from another tank won't help you much in that regard.

not4you

What about water from a deep gravel vac? Could you possibly get enough bacteria from that to help kick start the cycle on a new tank?

Jon

it would be better to put your filter in the new tank or to take a handful of gravel from the old tank

Butterfly

If you have time you could run your new filter on an old tank for a couple of weeks and then change the whole filter over with a couple of handsful of gravel and other decor from the other tank. Just a thought
Carol