I have two 10 gallon tanks. Each has a whisper filter. Both tanks have been cycled. Readings are good.
First...how do I know when it is time to change the filter?
Second...will I have to recycle my tanks when I change the filter?
I am really stressing over this as it took so long to cycle my tanks in the first place and I do not want to kill my fish when it comes time to change the filters.
Thanks for help