This is my DIY video for my 75 gallon aquarium. I have made a pair of internal filters similar to a sponge filter except the filters are internal instead of external and I have added bio media that is already cycled into the filter. It turned out well. My tank is bare bottom so these filters work great for sucking the fish waste off the bottom of the tank. The only downfall with these filters is that alot of the waste falls out of the bottom and into the tank as I pull them out to clean them. I have since removed these from the tank but have plans to retry an updated version in the future.