Ok so I did alittle digging around an may have come up with a few possibilities but with out being able to exam the coral tissue under a microscope I can not say for sure.
Theory 1. Flat worms (some genus of them), flat worms come in a wide variety some harmless others not, the flat worms will live around the base of the coral were the skeleton and the flesh meet, they are small and brown or flesh tone they are known to eat into the flesh of the coral and lay there eggs when the eggs hatch they two munch on the coral. In theory the tips that have holes could have been the areas were the eggs were laid and hatched. In this theory the pests weakened the coral and eventually lead it to tissue narcosis. Flat worms are hard to kill at times and may require multiple dips of different solutions.
** I recommend API Melafix kills flatworms**
Theory 2 brown jelly disease how ever brown jelly diease is usually super obvious.
theory 3 would be a bacterial or protozoan infection.
Theory 1. Flat worms (some genus of them), flat worms come in a wide variety some harmless others not, the flat worms will live around the base of the coral were the skeleton and the flesh meet, they are small and brown or flesh tone they are known to eat into the flesh of the coral and lay there eggs when the eggs hatch they two munch on the coral. In theory the tips that have holes could have been the areas were the eggs were laid and hatched. In this theory the pests weakened the coral and eventually lead it to tissue narcosis. Flat worms are hard to kill at times and may require multiple dips of different solutions.
** I recommend API Melafix kills flatworms**
Theory 2 brown jelly disease how ever brown jelly diease is usually super obvious.
theory 3 would be a bacterial or protozoan infection.