What us this on my rocks??? Photos attached

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Are they safe to have in a FOWLR tank? I just got this rock from my LFS and it came with beautiful life on it and plants etc.
 
#1 looks like maybe a leather (purple/gray) could also be cucumber
also orange/yellow looks like sponge
#2 Halimeda a macro algae also green hair algae the orange thing no clue
#4 green hair algae and Halimeda (macro algae)
#5 same as #1

yes it's all safe in a FOWLR but get rid of the hair algae

looks almost like the rock I got
 
Why is green hair alge bad? Also these little centipede looking critters are on the rock as well... Also really small worms... Are they bad too?
 
Bristol worms are a good part of the the cuc

green hair algae is a indicator of high phosphates/over feeding
also it looks nasty when it takes over the tank
 
New layout! I think more sponges are present?



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