Filtration systems for aquariums

1. A filtration system for a fish tank, the filtration system comprising:

an upper housing having an interior cavity;

a lower housing slidingly coupled to the upper housing to permit changes in an overall length of the filtration system, wherein the overall length is measured along a vertical direction, and wherein the lower housing includes at least one water inlet configured to receive water from the fish tank;

a filter cartridge disposed at least partially within the inner cavity; and

a pump configured to draw water from the lower housing along the vertical direction and into the inner cavity and through the filter cartridge.

2. The filtration system of claim 1 , wherein the upper housing includes a notched area along a rear portion of the upper housing, the notched area including an angled surface.

3. An aquarium that includes the filtration system of claim 2 , wherein the aquarium includes a frame that defines an interior for housing water, wherein the upper housing is coupled to an edge of the frame along the notched area, and wherein the upper housing includes a first portion that is disposed above the frame and a second portion that extends within the interior of the frame.

4. The filtration system of claim 1 , wherein the upper housing includes a water inlet, and wherein the pump is disposed above the water inlet and is configured to pump water up through the water inlet and into the interior cavity.

5. The filtration system of claim 4 , wherein the interior cavity is defined in part by an interior wall, wherein the pump extends through the interior wall, such that a first portion of the pump is disposed below the interior wall but above the water inlet, and a second portion of the pump is disposed above the interior wall and in the interior cavity.

6. The filtration system of claim 1 , further comprising a heater and a temperatures sensor disposed at least partially in the interior cavity, and a controller in communication with the heater and temperature sensor, wherein the temperature sensor is configured to measure water temperatures as water passes through the filter cartridge, wherein the controller is configured to compare the measured temperatures to a desired temperature, and wherein the controller is configured to provide power to the heater based on the comparison of temperatures.

7. The filtration system of claim 1 , wherein the upper housing includes a water outlet along a front portion of the upper housing.

8. An aquarium that includes the filtration system of claim 7 , wherein the aquarium includes a frame that defines an interior for housing water, wherein the upper housing is coupled an edge of the frame such that the water outlet is disposed above the interior of the aquarium, and such that water passing out of the water outlet falls out of the water outlet into the interior of the aquarium.

9. The filtration system of claim 7 , further comprising a removable door coupled to the upper housing, wherein the removable door is disposed below the water outlet such that when the removable door is removed from the upper housing, water passes out of the upper housing in an area below the water outlet instead of through the water outlet, and a water level within the interior cavity is lowered.

10. The filtration system of claim 1 , wherein the filtration system includes a plurality of modular filter cartridges that are releasably coupled to one another, and wherein each of the modular filter cartridges includes a first guide element along a first side of the filter cartridge and a second guide element along an opposite side of the filter cartridge, such that at least one of the first guide elements on a first filter cartridge is removably coupled with a second guide element on a second filter cartridge.

11. The filtration system of claim 1 , wherein the lower housing includes a water inlet, such that the pump draws water into the lower housing through the water inlet.

12. The filtration system of claim 11 , wherein the water inlet is a first water inlet, and wherein the upper housing includes a second water inlet, wherein the pump is disposed above the second water inlet and is configured to pump water up through both the first and second water inlets and into the interior cavity.

13. The filtration system of claim 1 , further comprising a plurality of LEDs disposed along a surface of the upper housing.

14. The filtration system of claim 1 , wherein the lower housing includes a first water inlet and the upper housing includes a second water inlet, wherein when the second water inlet overlaps with the first water inlet when the lower housing is retracted relative to the upper housing, and wherein the second water inlet is blocked by the lower housing when the lower housing is extended relative to the upper housing.

15. A filtration system for a fish tank, the filtration system comprising:

an upper housing having a cavity;

a lower housing coupled to the upper housing;

a plurality of modular filter cartridges disposed within the cavity and releasably directly coupled to one another, each of the modular filter cartridges having a first guide element along a first side of the filter cartridge and a second guide element along an opposite side of the filter cartridge, such that at least one of the first guide elements on a first filter cartridge is physically and removably coupled with a second guide element on a second filter cartridge, wherein each of the modular filter cartridges is configured to separately filter and clean water within the cavity; and

a pump configured to draw water into the cavity and through the plurality of modular filter cartridges.

16. The filtration system of claim 15 , wherein the plurality of modular filter cartridges are coupled to one another in a quick-release manner, such that the first filter cartridge is removable from the second filter cartridge by pulling on the first filter cartridge.

17. The filtration system of claim 15 , wherein the first guide element is an elongate, generally T-shaped protrusion along a side of the filter cartridge, and the second guide element is a hook-like member that releasably grasps and retains the first guide element.

18. The filtration system of claim 15 , wherein the upper housing includes a water outlet along a front portion of the upper housing.

19. The filtration system of claim 18 , further comprising a removable door coupled to the upper housing, wherein the removable door is disposed below the water outlet such that when the removable door is removed from the upper housing, water passes out of the upper housing in an area below the water outlet instead of through the water outlet, and a water level within the interior cavity is lowered.

20. The filtration system of claim 15 , wherein the lower housing includes a water inlet, and wherein the pump is configured to draw water into the lower housing through the water inlet.

21. The filtration system of claim 1 , wherein the inner cavity is configured to be disposed above the lower housing during operation of the filtration system.