Hi to everyone, I have just done my water change and as part of my routine I as always cleaned the sponge in one side of my filter in the removed tank water, I've just been thinking tho about the bio rings in the centre compartment, I noticed they have a brownish tinge to them which I'm assuming is quite normal, so regarding the rings do I have to do anything with them at all? Maybe give them a bit of a swill in same tank water? Do I have to replace them at all? Maybe just a portion of them at a time or something? I'm fairly certain I should never replace them all at one go as this would I think get rid of most of my BB, any advice would be appreciated.
BP
BP