I have been using BreakFree for 20 years with nitesites so thats not it. I don't know about Tetra though, never used it. Something had to have gotten on the white paint to stain it pink. Something red maybe, is Tetra red?
Winslow e-mailed me and said the red color is a reaction in the resin covering the light. He said it was the result of a cleaning agent that was used after the installation of the light. He said it harms nothing but they will replace the sight with new sights, free of charge, that will not do this. Seems strange they did not put those on in the first place.