As for the frags, I can sell the a few ways. I can cut the frag off, as is, or cut some of the rod off and insert into a small piece of live rock with a hole that is already in it or i can drill.
The Bio ball topic has many different opinions. I feel they have no more of a chance of building up nitrates than the live rock rubble. Joe down at Fish world has displays of 1200, 900, and a 150 gallon in the store and no problems with nitrates. He has a lot of bio balls in the systems. He also has a small tank that has been running for 13 years in the store and no problems.