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I watched Cory's video and have since hot-rodded all of my filter returns on three different tanks. They do a great job of pre-filtering which allows me to decrease the maintenance on my filters and well as they do a great job of housing lots of beneficial bacteria which has lead to cleaner and healthier water. If I had one critique it would be that I wish there were a larger variety of interior diameter sponges. In Cory's video he shows ways of modifying your return tube diameter, but that's not ideal in my opinion. I would think there would be a way to get the filters the right diameter or to sell some type of pre-made adapter. But all in all, I would still use them because they are such a great add on for your filter and tank!! You can see the "Large" sponge on the far left which is on my AquaClear 110.
These medium intake sponges are just the thing for AquaClear 50 hang on back filters. I stick a small piece of lava rock into the bottom hole, works like a charm.
I really like this filter. It keeps the impeller clean, doesn't reduce flow noticably, and increases surface area for b.b. growth. The flaw is the hole that goes all the way through, I am not sure why it is not like the other intake filters you have that are closed on the bottom. It is simple to fix, if you have other filter material on hand.