First off, thanks for the compliment, we are very happy with how it turned out. If you like our rock work, just check out Super Fudges tank build, because his was the inspiration to ours.
We first made a structure out of pvc. Then drilled random holes through out it so that water will never settle in it. Also, the holes work for great for putting zap straps through and attaching the rocks to it. If you are ever wanting to do it, shoot me a pm and I could go over it better with you.
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