I have read a number of posts that talk about the advantages of having dual filters on an aquarium. I have a 40g tank with a Whisper 60 filter. For the most part all is functioning well. Maintenance of the filter would be easier and less traumatic to the fish if I could keep another filter going during the process. Thoughts?
If another filter seems like a good idea, what kind of filter would make sense? I have heard that a bio-wheel filter is very good.
On another matter, I have been wondering whether or not I need an air stone. The fish seem fine, but do seem to get a bit more animated during water changes when the filter water is falling into the tank and making bubbles. Is this just general excitement because of the noise and new water or are the fish benefiting from more oxygenated water during the pwc
Once again, thanks for the help!