i made a free standing rock pile useing pvc here is some pic's.
i used a 1'' rotohammer to drill a hole right in the middle of the live rock then stacked them from smallest to bigest.
here is some pic's of the drilling.
hard to tell from pic's but that is tonga shelf rock on the top and it is like 22'' by all most 30'' i am useing it as a frag rack.
here is some pic's of the drilling.
hard to tell from pic's but that is tonga shelf rock on the top and it is like 22'' by all most 30'' i am useing it as a frag rack.
If you want something even smaller. You can use a 1/4" drill bit and one of those fiberglass reflector sticks. that is what we use at the shop I work at.