Aquarium and non-disruptive filtration system

An apparatus, comprising:

• a tank having a closed end and an open end;
• a filter base dimensioned to be removably positioned over an interior surface of the closed end, the filter base including inlets and a housing support structure;
• a filter housing having a proximal end dimensioned to removably receive the housing support structure;
• a filter cartridge disposed within the filter housing, the Filter cartridge separating a first chamber of the filter housing from a second chamber of the filter housing;
• a pump disposed within the second chamber of the filter housing, the pump having an input in fluid communication with the second chamber, and an output connected to a proximal end of an elongated tube;
• and
• a reservoir dimensioned to be removably positioned within the second chamber at a distal end of the filter housing, the reservoir being connected to a distal end of the elongated tube and including an outlet structure, wherein:
• the pump operates to mechanically draw water from the tank through the inlets, into the first chamber through an opening in the housing support structure, and across the filter cartridge into the second chamber;
• the pump operates to mechanically pump the drawn water through the elongated tube and into the reservoir;
• and
• the reservoir discharges the pumped water into the tank through the outlet structure.