I have a 6 gallon tank for Betta and was looking for a good filter. This works very well. I had to cut the plastic tube off the top (easy to cut, I did it with a kitchen knife!) to fit my 6 gallon tank underwater. I also bought an air stone to put in to reduce the flow. I attached the airstone with a small piece of 1 inch tubing. This is an ORIGINAL sponge filter and not one of the many Chinese fakes you will find at Revain and elsewhere.
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