Air Pump By visan.chai in LivingPets1,90492Save PDFFavoriteIntroduction: Air Pump DIY for small aquarium. Step 1: Find Small BoxStep 2: Small Water PumpStep 3: Make a HoleStep 4: Put Water Pump to the Hole.Step 5: Make a Hole on the Bottom.Step 6: Put Any Filter Inside.Step 7: Finish.