#1 is a bubble tip anemone or a manjo anemone. BTA good, manjo bad. If it's under 2" it's surely a manjo and is best killed.
#2 is a hairy mushroom. Desirable, but can also sting some corals.
#3, ?. Sort of looks like pocillipora, but it looks like it's just encrusting whereas pocillipora generally starts branching almost right away. Is it hard or soft? Does it look the same all the time, or does it have tentacles that come out but retract if disturbed?