I just bought the Fish Disease Diagnosis and Treatment book by Edward J. Noga. Very impressive book. I would recommend it for everyone.

Few things surprised me just by looking at few pages:

1. Nitrite never been shown to be toxic to fish in seawater.
2. According to the book you need to go fallow for 3 MONTHS in case of Marine Ich. This news is very disappointing if you let M.I. into your DT, as 3 MONTHS is not not 6 weeks.