no, but dont add any more fish for a good few weeks until the new filter has formed its own bacterial colony, as long as the original filter is still in then things wont change.
Hi all
I just bought a new filter to use in conjunction with my old one.
Will my tank have to go through another mini cycle for the new filter to catch up to speed with the old one?
thanks![]()
Providing you keep your old filter running at the same time as your new one then I can see no reason for you to have any problems.
Your old filter will still have all the beneficial bacteria in it, and in time they will seed your new filter.
This could take a while to happen though so dont remove your old filter too soon, better still would be to have both running permanently.