This thing is small. It is rated as a 40 gallon, in tank filter. There is only enough room for a little bit of media, and the only thing included is a thin strip of black sponge, the more porous kind for housing bio bacteria. But that's it. It will not hold Purigen in the bag, nor does it come with regular floss or carbon. You could add carbon to it in loose form. At least add some small bio-balls, or folded up filter floss. It would not be sufficient as your only method of filtration on a 40 gallon tank. Really, on any tank, as it is. However, it is quiet and produces a good outflow. The little suction cups work well, also. I'm using it in my 75 gallon tank as extra filtration, but mainly to agitate the surface. (I am using the suction cups to hold it on, almost at the bottom of the tank, and have the outflow pointing up) It has a few different attachments so you can point the outflow however you like. There is an attachment to attach it to an air pump also. One thing that is dumb: THERE ARE NO INTRUCTIONS. Luckily it's basic and I've set up and tweaked filters for many years. If you're looking for a cheap filter, spend the extra $5-$10 and get something else (BIGGER) from a bigger named company. Do not use this as your only means of filtration, because it is not large enough to hold the proper material for adequate filtration. You need (1) Aquarium floss or a sponge to collect debris that's floating in the water (2) Something porous to allow beneficial bacteria to grow on (VERY IMPORTANT-Google 'Nitrogen Cycle') (3) Possibly carbon, to purify your water. (You have to change it regularly or it starts to pollute your tank) So it's not big enough to house all that...but it is excellent to move water (avoiding "dead spots") and help oxygenate the tank (by agitating the surface). Also cheaper and quieter than a power-head setup, and just as effective.
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