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Water change without sucking [okay not really a hack but its good to know for those who don't] - I fill about half the gravel vac tube (the half that goes into the tank) with tank water, then cover the other end of the gravel vac (with my finger). Take the half out of the tank, with part of the tube with water outside the tank hanging over the edge of the aquarium. Then let go of the other end it starts to siphon water out.






