Yea that other dude is correct on first pic. It's not harmful at all but yet on one of my clients tank its growing on a green poccilopora and killing it a bit. Apparently it uses up a bit of calcium.
The second.....well myself I'd try to kill. Just my opinion. Some people call it a rock anemone but I consider it a pest and lean towards aptasia. Unless your trying to identify that other thing in the pic, I had something similar but it was red and kind of like some sort of bubble algae and can't help you there.
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