Fish all look sickly, yet water seems fine...HELP!

[newreefer_59]

Just started 2 days ago in my SPS/LPS 150 gallon tank. Have 16 fish, and none look good though they have improved marginally over the past 12 hours. Still cannot see 3 of my 4 tangs at all. I do have 4 mini maxi carpet anemones and they appear to be standing up. Is this a possible cause? Are they possibly mating or are they defending themselves? I did spot a bristle worm recently too. Anyway, any thoughts on this?