Simply picking up a rock with palys or zoas on it and moving it inside the tank can get paly toxins released. I believe any time a zoa or paly slime's, it's releasing toxins.
Recently, late one morning, I was trying to get rid of a serious infestation of a nuisance algae. I pulled rocks out and dipped them for 3 to 5 minutes in hydrogen peroxide from the store. It's 3% so I didn't dilute it. It bubbled like crazy. I wore gloves. The zoas on the rocks were really annoyed and slimmed like crazy. I believe the toxin in the water was released into the air when bubbles at the surface popped. The treatment of my rocks and coral went on for a couple of hours.
I was fine the rest of the afternoon. But after dinner I started to get stiff mussels and aching joints. By the time I went to bed I was felling a bit nauseous. When I woke up about midnight I had to breath deeply to get enough air and keep the feeling I was going to throw up at bay. I did manage to get back to sleep a couple of hours later. In the morning I felt better, but still felt like I had done a serious workout the entire previous day.