If you are buying this to clean your gravel, dont buy!
I don't understand what the plastic tubes were for. The only way I can get water to be sucked is if I stick the motor straight into the aquarium. Due to this gravel isn't sucked up at all and just frustrates you. It does work for water changes but again, the tubes don't suck any water up so you have to stick the motor straight in there to get results. Also, the packaging of how to assemble this is horrible and I would not recommend this product to anyone.
Rating: 2 stars