Made these simple 6 X 10 frag racks for a couple of bucks. They are great to keep light acclimating frags off the substrate where my Pistol Shrimp and Gobies would bury them. I kept one and shared the rest with fellow reefers. I had left over egg crate from a tank cover I made for my 40 gallon breeder so the only other material I bought was a 3 foot piece of 1 inch pvc pipe and 16 pvc caps and a bag of electrical tie wraps. I cut 16 4 1/2 inch pieces of 1 inch pvc. Slipped a cap (no glue) over one end and filled the pipe with some old aquarium gravel I had. Slipped the other cap on and tapped them all the way in with a hammer. Then place the 6 X 10 piece of egg crate on top and slipped 2 tie wraps around the pipe and rack to attached them and cut off the excess from the tie wraps. Repeated 16 times I had four of these little racks I can move from tank to tank as needed.