Patent ID: 7997232

Claim:
An aquarium, comprising: a box having an opening and accommodating space therein; a dividing board disposed in the accommodating space of the box to divide the accommodating space into a cultivating layer and a nitrobacteria layer, the nitrobacteria layer being disposed with a plurality of bacteria filter balls; an immersed pump disposed inside the accommodating space for drawing water in the cultivating layer and air outside the box, mixing them into bubbles, and sending the mixture out via a transporting pipe; and an immersed foam remover disposed inside the accommodating space and connected with the transporting pipe and having a foam outlet and a water outlet; wherein a water inlet pipe is disposed in the nitrobacteria layer of the box for injecting water from a source into the nitrobacteria layer and an outlet pipe is disposed near the opening of the box for the excess water in the box to flow out; and wherein the bubbles received from the transporting pipe is broken into smaller bubbles in the foam remover; protein impurities in the water are expelled with the bubbles via the foam outlet; and the processed water flows via the water outlet into the nitrobacteria layer to decompose the proteins.