Hello, I am hitting a market with some tough players. I would like to secure myself once I start getting the top positions. So far I've been ranking by using simple PBNs, profiles, blog comments and forum entries. I am trying to block robots.txt of my PBNs via htaccess in order to make them at some point not visible for my competitors. Anyhow what steps can I take to secure myself from the competitors trying to destroy me?