Interesting, do you have a pic of that? I was trying to think of a way to get the grid attached to the tub so I can use just water underneath. I'd be afraid of it failing tho and having eggs drop into the water. I'm gonna take a strole thru home depot and see what might work well
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Just cut 5 PVC pipes that are 1" In diameter 2" Long. Hot Glue or Super Glue them into the 4 corners of the tub your gonna use and one in center. Then take the light diffuser and lay it on top, Toss in your water and you wont have to worry about it falling.