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I am leaving this with no details on purpose as to avoid jumpy conclusions. Thanks for sharing your experience in advance. See all responses will help me narrow down.
Boy, that's like saying why am I having chest pain...... I mean, where do we start?
Here is a shot in the dark for you though..... Parameters off, too much light, not enough light, too much flow, possible pest, bacterial infection, you just dipped them, a hermit walked on your colony, you just finished fragging, wrasses were eating something In between the polyps. Changed lighting recently, switched salt brands, ect ect ect. Ugh..... Why am I having chest pain.
The part that really has me confused is how spread out they are. They usually grow in such a tight cluster. Try turkey basting them. Maybe a Algae is bothering them.
Not good at pictures but here you go.That's what they should look like. Can you give us a picture of the side of the tank they are on. They seem to be moving away for a reason. Maybe more light maybe less. I bet that's why they are so spread out. Could also be some one is chowing on them.
I hate those little things. Man how cool they look when your new to the hobby haha. Yeah when I see one covering the top of my zoa I normally consider it gone haha. No stars on this colony yet so I'm hopeful.Looks like they might be moving somewhere I had some zoas do the same thing for no reason then they start falling off the plug polyp by polyp cutting a frag and moving it helps save them sometimes ,I tryed dipping in lugols , peroxide, but it didn't help at all . When I see the little white starfish on top of my zoass they close up and then I find them looking similar to yours
No carbon change recently. Actually I need to but some.Did you change the carbon recently? I went from using cheap carbon to premium and I had zoa do this.
Po4 was at .25. It is now .18. I use brs gfo and reactor. I just changed out the gfo but this started before that change.Fwiw in my experience they don't heal from this , you'll be lucky if a polyp pulls through. IME this is po4 related and lights. I've found if po4 is brought to low and lights are strong then they will wither away and expel from the the insides and they will only heal if taken out of this environment or the environment itself is changed quickly . It's not a guarantee but I do notice it if I change out touch gfo or push my carbon doing a Bit too much.other zoas seem fine but there's always one that does it.
How do you export po4 and where do you sit on average?