Bubbled Duncan tentacles

Hello!! This Duncan has looked like this 98% of the time for the last 4-5 weeks. However, it has produced two new heads during that time. What can be causing this? Growing pains? There are no other coral around it, in fact nothing in this tank is capable of stinging it. Is it perhaps the fish simply swimming around it all the time, blowing water across the heads?

Thanks!!

 

Looks like its ok to me. Some duncans have longer tentacles than others. The fact that its growing new heads is good so i wouldnt worry at all.

 

Cool. When I got it, she was your typical looking Duncan, picture perfect, long and radiant heads. It's retracted like this all the time now. I'll be more patient then!