I have a 125g community aquarium with a gravel bottom. The length of the vacuum chamber is PERFECT so I don't need my hand to go all the way into the tank. The chamber size is also handy as you have a lot more room to separate gravel and dirt. The fitting on the end allows you to insert almost any end of male garden hose into the adapter, allowing you to use almost any length of hose. I attach a 25 foot garden hose to mine and run it through the door to my front yard so I can put wastewater to good use instead of pouring it down the drain. I will say that this is definitely intended for larger tanks and is definitely overkill for something like 30 or 40 gallons.
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