What size is the tank and whats in it?
Its fine to run multiple filters. You can run them both for a few days or a week and get rid of the old one, or put the cycled media in the new filter and just use it. You can also get a replacement impeller for relatively cheap.
Its fine to run multiple filters. You can run them both for a few days or a week and get rid of the old one, or put the cycled media in the new filter and just use it. You can also get a replacement impeller for relatively cheap.