Dangerdoll
Global Moderator
Are you using the media from the old filter in the new one? I don't know if it's such a great idea to switch the filters at the end of a cycle but keeping the old filter in place while this one catches up is definitely the better way. About the towels and the filters, I really don't think the small amount of light that will get in will be a big deal but if you want, here's what you can do.. (I know what it's like to need to have it done a certain way
) what you can do is take a couple small hand towels and from where the filters hang over the tank, pull it a little away from the glass and fit the hand towels in between the filter and the glass. When you let the filter go, it will hold the towel in place. shikes, I hope that's not too confusing 