Are oxybenzone and octinoxate bad for coral reefs?

Yes, but the science is messy and the real damage might be smaller than you think. Lab studies used unrealistically high concentrations, and in real seawater, UV filters are usually below levels that cause bleaching. Still, I’d avoid them—use mineral sunscreens like zinc oxide or titanium dioxide instead. Don’t trust “reef-safe” labels; check ingredients yourself.