I was watching a video of a guy sitting up his reef and he cuts pieces of hard airline tubing and uses it to help support his live rock (inserting tube into the holes in the rock). He also drills holes in some corals and inserts the tubing so he can place the coral where he wants it. I think this would be a good way to help stabilize my live rock, but I've never seen a place that sells this hard airline tubing. Any ideas?