Hi everyone, I have a cycledplanted tank with some large lava rocks that have been in it for several months. A friend is starting a new tank- would giving him these rocks be good for seeding his new tank? Or would it do nothing?
What I normally do is keep an extra sponge filter or two in tank and move it to a new tank when i want to cycle it. A good quality sponge filter can hold a lot of bacteria.
To be honest I'm not sure if lava rock sitting in the tank has a lot of bacteria - it does no harm but i'm not sure how effective such will be.