I looks like they are barely closed up like they may be getting too much flow or light. I also heard that zoas like a little more dirty water because they are found in lagoons where there are plenty of nutrients. Other than that like Faciosity said, sometimes they just close up for no reason and then open up when they feel like it. My PPE just closed up recently and I thought it was a gonner but a few days later it was opened up and looking great. They are just really weird. My Magicians just closed up one day and never opened up again and melted away. I have no clue why to this day. I never moved them since I put them in the tank. They were great for a month or so and then just closed up. Good luck with your AOG's though. The dip might not be a bad idea regardless of if its flow or not. Better safe then sorry!