had a eibili angel that came down with
ICH.

Treated that for 2 weeks and everything seemed fine.

Now I notice he has some frayed fin edges and a small ammount of this white stuff hanging off his tail fin.

Is this fin rot? Looked online for help, but all of the help was for freshwater. What kind of medication can I use and will it hurt inverts too?

Do I have to setup my hospital tank again? If so, man that stinks.
Oh yeah, tank parameters:
pH: 8.3
ammo: 0.0
trite: 0.0
trate: >12.5 mg
specgrav:1.022
temp:78
also did 10%
water change