Hi guys. Well I think I found a DiY air stone. I got a big Styrofoam cube, spray bottle and acetone. I put some acetone in the bottle and lightly sprayed the cube. Then I rinsed it right away so it wouldn't eat the whole thing. Then I made a small hole for the tubing and stuck that biotch in there. I tested it in a clear bowl and there are many bubbles coming out (big and small). I'm not sure if the acetone stays in the foam and will kill the plants. I dont wanna try it. But theres one way, although its not with regular household products. But with acetone, you can shape the foam any way you want to. Anyway, from one stoner to another.
Peace