Take a look at this thread on velvet https://www.reef2reef.com/threads/velvet-amyloodinium-ocellatum.217570/
If indeed velvet I expect you will start seeing signs on your other fish within the next couple days. Velvet is a hard and fast killer, it does not mess around. If you have other concerns or need help I would encourage you to start a thread in the fish disease section, I don’t want to derail OPs thread. I’ll try to keep an eye out for it but you can also tag me in your thread.
If indeed velvet I expect you will start seeing signs on your other fish within the next couple days. Velvet is a hard and fast killer, it does not mess around. If you have other concerns or need help I would encourage you to start a thread in the fish disease section, I don’t want to derail OPs thread. I’ll try to keep an eye out for it but you can also tag me in your thread.