Clear bubbles forming at opening of closed polyps

Xirxes23

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What would cause previously healthy zoanthid polyps to close and develop clear bubbles near or over the opening? I dont see discolorations really, about 4-5 polyps on a 30 polyp frag are showing the trait but i am at a loss!
 
i only see one polyp with bubbles left, but currently i have 3 sick colonies, all of which were initially opened in my tank, and now are closed. Many other health colonies, but please look at these three and see if there is anything in particular that sticks out that may help save them!

Water levels are all danged neer perfect, have inspected each for parasites, and dipped each twice in FW over the last week. Running out of ideas. Any help would be aprreciated.

first one
newsick-3.jpg


this one had the clear bubbles on some of its polyps
newsick-2.jpg



these may be AoG's but sick :(
newsick-1.jpg
 

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