Could you take a pic under white lighting by chance? That might help others answer the question a bit better. It’s kind of hard to tell under the blues.
And maybe closer up? It might be it's mouth but euphyllia, and most other corals, can bubble from too much blue light like bounce mushrooms do. They can also form baby colonies by growing a piece of skeleton separate from the main skeleton and that may initially look kinda like a bubble in the coral undil it get's heavy enough to hang down.
So Day 3 and have decided to remove coral from DT. So far still no clue, here is the latest sick spot. About to do a peroxide dip and light iodine dip. Not sure if I should cut the head? Please Please any help appreciated! No idea what I’m doin as a coral doctor.
So Day 3 and have decided to remove coral from DT. So far still no clue, here is the latest sick spot. About to do a peroxide dip and light iodine dip. Not sure if I should cut the head? Please Please any help appreciated! No idea what I’m doin as a coral doctor.