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The hourglass of the tank is in view of the small number of simple fish tank. Home use small cylinder, on the steps to fish in the water often encounter a lot of trouble. Like the fish out first, but also on the replacement of water in the fish tank, more complicated. The fish tank in the fish in water, can not disturb the free activity of fish, the fish tank Angle of tilt, water will flow from the outlet of the upper. The structure of the tank by the hourglass of at the bottom of the cylinder block and cylinder head, on the cylinder head with rubber ring, sealing capability. And the modelling of the tank and beautiful.
East China Normal University