Decline in health scores for Leiopathes fragments during the 2012 and 2013 visual impact studies. Kaplan-Meier time-to-event curves of red and white fragments in response to the chemical treatments at concentration of 25 mg mL^–1 for 2012 (A, C) and 2013 (B, D) visual impact studies. The event was a decline in health rating to ≤3. In 2012, control fragments (purple lines) were healthy throughout the experiment, but in 2013 control fragments declined in health between 72 and 96 hours. DOI: https://doi.org/10.1525/elementa.261.f3