What are these things?

[Deadeye]

Green bubble like things, and neon green long things.

 

[SoupySteve]

it's a kind of algae - I saw a thread where some dude's entire tank was covered in them (I don't think that they are normally that prolific). If you can sustain their growth, I'd like a start of them from you sometime! Leave the bubble algae alone unless you can remove it WITHOUT BREAKING OR POPPING IT.

 

[inlandreef]

The round ones are called bubble algae. Green Emarald Crabs are known to eat it. The other one is a harmless algae call monkeys paw.