Aquarium tank filter devices

Claim 1

IN AN AQUARIUM TANK DEVICE, A CASING COMPRISING A FILTER CHAMBER, TWO WATER INLET CHAMBERS ON LATERALLY OPPOSITE SIDES OF SAID CASING, SAID LATTER CHAMBERS HAVING SIDES OF STEPPED FORMATION WITH STEPPED PORTIONS AT DIFFERENT LEVELS, SAID SIDES HAVING A PLURALITY OF HORIZONTALLY EXTENDING WALL PORTIONS AND WATER INLET PORTS AT SAID STEPPED PORTIONS, SAID INLET PORTS BEING POSITIONED IN SAID HORIZONTALLY EXTENDING WALL PORTIONS, EACH OF SAID WATER INLET CHAMBERS BEING LATERALLY FLANKED BY AN OUTER WALL WITH STEPPED EDGES AND AN INNER WALL, A PANEL ADJACENT EACH OF SAID INNER WALLS AND HAVING AN UPPER WEIR EDGE IN THE REGION OF THE UPPER PORTION OF THE ADJACENT INLET CHAMBER, A COVER ON SAID CASING, THE TOP OF SAID COVER BEING IN SPACED RELATION TO SAID UPPER WEIR EDGES OF SAID RESPECTIVE PANELS, WATER PRUIFING MEANS IN SAID FILTER CAMBER, AN APERTURED GRATE AT THE BOTTOM OF SAID FILTER CHAMBER AND IN UNDERLYING SUPPORTING RELATION TO SAID WATER PURIFYING MEANS, SAID GRATE BEING IN SPACED RELATION TO THE BOTTOM OF SAID CASING AND FORMING A WATER OUTLET CHAMBER BETEWEEN SAID GRATE AND SAID BOTTOM OF THE CASING, AND PUMPING MEANS OPERATIVELY CONNECTED TO SAID OUTLET CHAMBER FOR DRAWING WATER FROM SAID LATTER CHAMBER OUT OF SAID DEVICE, WHEREBY WATER WILL BE OPERATIVELY DRAWN THROUGH SAID INLET PORTS INTO SAID RESPECTIVE INLET CHAMBERS AND UPWARDLY TO SAID RESPECTIVE WEIR EDGES AND INTO SAID FILTER CHAMBER.