1, 2 - zoanthids
3 - Coenobita sp. (aka Mexican red leg hermit)
4 - snail, unsure of species. shell looks like Nassarius but I don't see a long siphon in pic.
5, 6, 7 - sponges, not sure of exact species
8 - Turban snail - Tectus fenestratus
9 - not sure but looks large-ish and round, maybe Nerite? or Margarita snail, Margarites pupillus.
10 - Euphyllia sp., either E. ancora or E. divisa (aka hammer, frogspawn)
11 - Favia?
12 - could be Cerith or Littoraria sp. (aka periwinkle)
13 - Cladophora sp.
last pic - mushroom, Discosoma sp.