Update: Fish Gallery in Dallas was open!! I pulled the anemone because the fish have been standoff-ish around her the last two days. Then I put in some oxygen for 1 hour. Right now, oxygen (via pump like for freshwater tanks) has been off for 15 minutes and they are not breathing heavily.
I do have some elevated nitrates and nitrites, so am anxious to go get some more RO salt water. Just did a water change yesterday. I think it's the anemone. I have isolated her outside the tank, and the poor fishlets are searching the tank for her.
Please feel free to send any advice!!
Thanks,
Matti