Review on 🐠 FEDOUR Submersible Internal Filter with Water Pump for Fish Tank, Ideal for Aquariums up to 35 Gallons by Kathleen Roy

Absolute rubbish. I replaced an old filter that no longer worked with this filter. My crystal clear 30 gallon aquarium containing only five guppies, an algae eater and a few small snails turned into a green mess in a week. I removed and cleaned the filter but there was almost nothing to clean. There were a few fragments of plant material in the sponge filter and nothing else. I tried replacing the sponge with filter threads and there was very little improvement. I removed all my guppies from the aquarium while waiting for another filter to arrive. Even with just an algae eater and a few snails, this piece of junk couldn't do anything to clean my tank. I have charcoal in the tank but there is no room in the filter to add charcoal.