Can I ask for some one to post photos of their hatching jars? I hadn't thought about using hatching jars so have never looked at them. I was looking at a fishroom video today that looked like their hatching jars had sponge cut to fit the bottom and slid over pvc riser with holes drilled in the base with an airline run down through the middle of it so the whole thing was a airlift sponge filter. The outlet went out through the lid of the jar by the look of it.