Ok so I bought these when I upgraded my 75s to 125s. They are used to taper forward to remove surface tension and two below to remove dirt from the base. It creates quite a strong current in the tank which at first I thought was too strong for these guys but they are fine, it also clears all the debris out of the tank which is very good as you can see in my photos. I keep the reservoir fairly clean. and doesn't like trash at all so it's the best environment for her and my family and friends better watch. It has been very beneficial to these fans and I highly recommend them, if we caution I would say that buying a four pack would require at least a 125 gallon aquarium or using it in several small tanks as these are very powerful pumps acts .
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