PUBLISHED AGAIN!!! The November 2016 issue of Practical Fishkeeping has my article on how Hole in the Head (HITH) and Head and Lateral Line Erosion (HLLE) are not the same, their causes, and treatments.
If you want some very specifically shaped live rock and can’t seem to find the right pieces anywhere then making your own may be your best option. Obviously you will still need to get some actual live rock to seed any rock that doesn’t start as live rock. If making your own rock sounds like the option you are looking for here is a great article on it: http://www.practicalfishkeeping.co.uk/features/articles/how-to-make-your-own-live-rock