Review on Eheim Filter Cartridge Mini Flat Mini Up by Stephanie Zebell

These are replacement foam filters for Eheim mini filters. They are perfect for both types of minis. Easy to wash and reuse, they last for several months before needing to be replaced. I use mine in an open water paludarium with poison dart frogs, 3 gallons of water total. The filter ensures crystal clear water and constant movement. Ideal for small aquariums with few fish, but not suitable for fish that produce a lot of excrement such as goldfish.