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Right now I have a powerfilter in my FOWLR. I have sponges in the filter and ceramic rings. The rings cover my whole filter so do I need to put my rings in a bag? Or can I just leave it bagless?
You are going to have to keep the rings and sponges very clean or you will have a nitrate factory on your hands. Personally I would keep them in a bag and rinse very well when I do a water change. The sponges the same way. With the type of filter you have make sure you keep up on water changes.