PE = happy SPS?

[Aquattro]

Keep in mind that your tank is still very new. As long as the frags start to encrust the rock in a couple of weeks, don't worry about PE. Yes, they can grow fine without it. I'm not even sure happy acros have PE, or unhappy. A good sign is night time PE, so check with a flash light after lights out. That shows a feeding response typical in the wild.