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You know what, that's exactly what it is. I looked it up and the pictures resemble what I have in my tank exactly. Thanks. They are good though, right?
Brush the cyano off in a seperate container of tank water to get rid of it, you don't want it spreading. Your worms look like spionid worms I have tons in my tank and feed off left over waste and detritus, they are fine but some say the can irritate corals but I've never seen it.
The orange thing is a sponge harmless filter feeder.