Suction cups are useless I wouldn't buy this product if it wasn't so cheap I would return it and stick it Wall of the first aquarium, clean the glass, come back in an hour and it's floating! No matter how cheap it is, it won't work on anything larger than a 10 gallon tank, maybe two for a 20 gallon tank, but it's useless because they just float on the water surface, don't stick and it cannot be appended. or keep robbing them down I wouldn't buy again
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