Thanks. In the event that I cannot catch him, is it OK to treat the entire DT?Cauliflower appearance can be either lymphocystis or Bacterial. This looks like the aftermath of an open wound which has led to a secondary bacteria issue. I would start with a 90 minute bath in a bucket using Ruby Rally Pro followed by antibiotic in a QT tank using Maracyn 2 or Triple Sulfa or similar for at least 7 days.. Do note antibiotics can affect each fish differently. Increase oxygen during treatment of any fish.