I use 2 aquaclear 50 in 2 of my aquariums but I also have a Penguin 200 in other aquariums and side sponge filters in all my aquariums. I use these sponges in ALL filters and occasionally as a pre-filter I cut them up and stick them onto the intake manifolds. They are excellent for retaining beneficial bacteria in all cases while filtering out dirt and debris particles. This pack is affordable and ideal for a variety of uses. I even use them to clean aquarium panes as they aren't too rough.
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