Wow I just added 2 to my 75g tank and it's almost overflowing (remember my sump return pump is already doing over 1000 gallons per hour delivers). The circulation is really good, I have an almost perfect double circulation. The suction cup is so strong that you can use it to open the microwave door (that was my test of whether it's a good suction cup or not). Construction looks cheap, but not cheap junk. It's only been in the tank for 3 hours so can't comment on durability but for the price even if they only last 1 year you can't go wrong. I would recommend them to anyone looking to add a flow to their aquarium.
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