Help me identify those

Guys more stuff to identify:
That green thing is getting bigger and bigger. At first I thought it is something that might get stuck but it is growing.
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Red jellow looking thing

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And some like white worms

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I know. I have some cyano problem. But I'm trying to keep it as low as possible. Even reduced food amount. I think it all might be because of that pistol shrimp that keep killing my crabs.
 
#1 The green macroalgae is halimeda . It is harmless for the most part. Very large specimens could be an issue as they take in calcium and could compete with corals.
A few strands would not make any significant dent to calcium.
They tend to get brittle and break apart too, so I would not worry about them.

#2 Could be some form of graciliaria

#3 Tiny feather duster / tube worms. They are filter feeders and are harmless to the tank. (Their sharp tubes can scrape your skin though, so be careful handling the rocks).
 
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