[header] How to clean a small fishtank [title] Schedule time to clean your tank. [step] With small fish tanks, you must do fifty percent or larger water changes at least twice weekly but preferably every other day. Without massive, frequent water changes, the tank can destabilize and put your fish at risk. 
Thus, it is important to schedule time to do your fish tank water changes and cleaning. Every other week, perform deep cleanings in which you remove decorations and scrub the interior.