The brown is Dictyota spp. while the red appears to be Halymenia floresia (per Macroalgae guru Dr. Collado-Vides at FIU.
Halymenia is a red drift algae while dictyota tends to remain anchored I believe (so if it's washing up that's probably due to increased and/or heavy wave/wind action. It has been suggested that increases in both may be linked to increased nutrient levels, likely from runoff, so if it had been raining and the beloved CORPS dumping lots of H20 down the Caloosahatchee followed by windy weather that might explain the increase in red drift algae. Clam farmers aren't too fond of the red drift stuff
