LOOE KEY REEF, Fla. — A Nassau grouper (Epinephelus striatus) hides in the shadows of the coral overhang to the right of the giant barrel sponge (Xestospongia muta). Other species present include brown clustered tube sponge (Agelas wiedenmayeri), slimy and other sea plumes (Antillogorgia americana, Antillogorgia spp.), black sea rods (P [...]