Here's my 72g custom reef. There are two rock "columns" one on either side of the tank, the tank background is foam and small pieces of live rock and Texas holey rock. There are four swim through tunnels (that you can't see in the pic) made from 1 1/2" pvc fittings and lots of little holes to stick frags in if I want too. It is stuck to the back of the tank using silicone, but I also made "feet" out of eggcrate that were zip tied into place and then foamed. My coral columns sit on these feet. My hope is that this stabilized the background even more and will prevent it from pulling off the back wall because of buoyancy.
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