The objects at the bottom of the aquarium appear closer than they are for the same reason that it is easier for bears to catch a fish once it jumps out of the water, because water bends light.
Light travels in waves. When these waves reach an object most of them are reflected and some are absorbed. The absorbed light determines the color of the object and how we perceive it. When light waves travel through water, they slow down and slightly change direction, creating a sort of optical illusion as to the true position of the objects underneath.
Therefore, we can confirm that the objects at the bottom of the aquarium appear closer than they are for the same reason that it is easier for bears to catch a fish once it jumps out of the water, because water bends light.
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