I think that CaribbSea intentionally and knowingly misleads people by calling this rock "life rock". It's not a real, wet live rock, it's the equivalent of some dry rock with bacteria from a bottle, then tinted red/purple in color.
When using any dry rock, the potential to have an ugly algae phase is definitely greater than when you start your tank using a good live rock.
In your case, I know that you've already added some live rock, so that's very good. The more live rock you can add, the better off you'll be as far as avoiding the ugly phase.
Many, many people successfully start tanks with all dry rock. They may indeed experience an ugly phase, but as advertised, it's a phase, and does typically go away on its own in time.
I believe your tank has been running for at least a couple of months or more, if you were going to have an ugly stage that would be right now. How's your tank looking? Are you seeing any nasty algae growing? If not, you're live rock may be helping here
Good luck!!