Exactly, that's why you have to move them up and down to find that honey spot. Or dim your lights and slowly increase the intensity if you are getting a bunch of new zoas. They seem to adapt better to changes to less light than more. Same with water flow, water purity, feeding, etc.
Like they say in investing "Past performance is no guaranty of future returns..."
I'm just saying that my experience with PPE or Tubb's blue is probably arbitrary. I think someone else in this thread said their Tubb's melted in bright light. Mine must be super tubb's or something because mine have just about taken over several rocks at the top of the tank. I have some RPE's that are mixed in with the Tubb's and they are thriving in high light as well, a little down colored, but still colonizing. There's no magic bullet number for zoas. Watch them and they'll let you know when they are happy.
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