Review on Optimized for SEO: Powkoo 7-Layer 🐟 Corner Sponge Filter for Aquarium Air Filtration by Andrea Jackson

I have bought several of these over the years. I use them in several aquariums. I have a fish room in my basement with over 20 aquariums ranging in size from 2.5 to 125 gallons. The sponge filter saves lives. Every aquarium I own has at least 1 sponge filter in addition to some sort of feed filter. If a mechanical filter fails, or in the event of a power outage, it's very easy to use a sponge filter as a life support system, provided it's packed with beneficial bacteria. When setting up a new aquarium, simply remove the sponge filter from the existing aquarium and place it in the new aquarium. It is so easy. This model has a flat end air outlet. I like it because small fish can't swim in and get stuck. I wish all sponge filters had this option. This is great for nano fish species.