before i start, i appologise for the modified pic 
ok, so heres an easy way to create an air stream in your tank....
As you can see, drilling a hole in the top of the filter head and pushing a piece of air line through (which needs to reach above water level for air to get in) will create a simple way to oxygenate your tank 
jsut as a warning, it is probably better to detatch the head of the filter from the body before drilling a hole, as you can see where you are drilling too. 
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