Its pretty basic.
Buy a length of 1/2" PVC, they are usually 8 feet long. Also buy some 90's and 45's, and if they have some 3-ways that will be helpfull too.
Now you have to decide what you want your final aquascaping to look like, then you build the framd out of the above mentioned pieces. You probably dont even have to glue the PVC if you dont want to.
As you are building the frame, you need to attache your rockwork one of two ways.
1. Drill through the rock so that the PVC can pass through the rock
2. Zip-tie the rock to the PVC.
You will probably use both methods.
As I mentioned earlier you can also get pieces of rock to "stick" together by drilling a few inches into each piece, and using a single pieces of PVC to connect them.
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