Make one!! You can turn any tank ornaments into an air feature by using the tubing you would normally supply the air deco with, just heat up a pair if pliers and crimp one end shut them drill holes in the tube for air to escape where ever you so desire.. I did it to make a bubble wall along the back of my whole tank a while back.. you'll just need a pretty strong pump or else the air won't make it to the end, you can also drill holes toward the end a little larger to encourage flow..
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