Help

[lewis74]

Woke up this morning and found my fish looking like the can anyone help he was fine last night . Everything is fine with my tank and other fish all look ok

 

[bluemon]

Looks like a severe bacterial infection.

You can read up more here: https://www.reef2reef.com/threads/bacterial-infections.191511/

The sailfin in this article has a very similar symtom as yours. http://www.reefedition.com/tank-terror-bacterial-infections-reef-tank/

What are you parameters?

Did you QT prior to additions?

Size of tank and other tankmates?