Which option should I take?

[Adrienne]

I currently have two four foot tanks pretty much surplus - 1 has a pair of kribs in it and the other has a single fighter and a couple of small catfish. Both tanks have external filters on them.

Am intending to remove the existing occupants and put in a different species to the ones that I have had in these tanks.

Do I just leave the existing water in the tanks and add the new fish given that the filters are cycled (making sure that I give the filters the chance to adjust to a heavier load) and that the water parameters are the same

or

Do I empty out the tank and just start again using the existing filters.

This sounds silly I know but I don't want to kill any new additions.

[wilson]

as long as the curent occupants are healthy i would just put the new fish in

[Ianab]

Plan A. If the tanks are cycled and healthy then just add new fish (a few at a time of course)

Anything else you do will require the tanks to partially cycle again, so unless the tank is a mess at the moment just leave it.

Cheers

Ian

[Wok]

Option A.

Just don't add a lot if fish at any one time.

[Adrienne]

Great, thanks

The tanks are spotless, they are barebottom, no algae or anthing else and

the water is as clear as.

[michael.qian]

cleaning it all over will just pretty much restart the cycle, like when you set up a new tank.

As long as tank is healthy and clean just add fish slowly, this way you can fully stock it a lot quicker.