Pineapple sponges and those annoying, tiny white tube worms that tend to grow everywhere. I don't know what the tiny tube worms are called but they grow in the most annoying places.
They are definitely pineapple sponges, at least the tube shaped ones. The other also aren’t hydroids, unless those have somehow managed to evolve to build a “skeleton” around themselves.
Looks to me like a variety of things. Definitely some pineapple sponges, spirorbid worms, and a couple feather dusters. Maybe also vermetid snails? They are normally purple though, unless they are long dead.