Couple thoughts...
1. Plastic storage shelving from home depot/lowes would work great. Unfortunately you'd wind up buying a whole set for just one shelf.
2. Build a PVC stand/shelf around/above the 40br to put the smaller items up higher. My thinking is 40 gallon on the shelf, frame around it, shelf above 40 gallon tank.
I created a platform for my turtles which is made of 1/2 inch(I could've gone with 1/4 inch) PVC. The frame is all PVC pipe and different elbows. They fit snug together with a couple joints needing to be fully sealed with pvc glue. I'd suspect you could make something using 1 inch PVC with a shelf on top for around $30. Lowe's sells individual shelf boards in different sizes.
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