elegance coral
They call me EC
Gall crabs are pretty easy to spot, if you know what you're looking for. There will be a round spot on the skeleton, about the diameter of a pencil eraser or smaller, right were the tissue meets the skeleton. It won't look like a crab. It will simply look like a piece of the skeleton that grew funny. If you find a spot like this, take a sharp object and gently dig the crab out of its hole.
It is most likely discharging algae due to excessive lighting.
I personally have not tried the antibiotics. They may help, but they are not a cure. The problem, IMHO, is damaged tissue. The antibiotics may help keep down the risk of infection, but will not cure the root cause. If you can get your hands on this antibiotic, it may be worth a shot???????? With a coral like yours, that's not showing any signs of infection, I don't think I would try this. That's just me though.
It is most likely discharging algae due to excessive lighting.
I personally have not tried the antibiotics. They may help, but they are not a cure. The problem, IMHO, is damaged tissue. The antibiotics may help keep down the risk of infection, but will not cure the root cause. If you can get your hands on this antibiotic, it may be worth a shot???????? With a coral like yours, that's not showing any signs of infection, I don't think I would try this. That's just me though.