Spot on Sailfin

[Debramb]

Hi everyone, anyone see this? She’
15-16 yrs old, 3 weeks ago transferred from
100 gal tall to 125 6’ long, dry rock, fine sand, nothing from 20 yr old tank and only few small fish from Dr reef, Firefish, Chromis and tiny Melanus Wrasse.
I found this 2 weeks ago and it hasn’t changed nor her behavior and appetite.
Both her and Regal heal from yellow tang scratches, but this is new. I feed Everything
Vetteguy recommends. Thanks
Debra

 

[Debramb]

Hi everyone, anyone see this? She’
15-16 yrs old, 3 weeks ago transferred from
100 gal tall to 125 6’ long, dry rock, fine sand, nothing from 20 yr old tank and only few small fish from Dr reef, Firefish, Chromis and tiny Melanus Wrasse.
I found this 2 weeks ago and it hasn’t changed nor her behavior and appetite.
Both her and Regal heal from yellow tang scratches, but this is new. I feed Everything
Vetteguy recommends. Thanks
Debra

Also, switched to fine sand and Oops, dirty glass, no other spots, verified w/magnifying glass, daily inspections
lol (no kids)