I was working in a very algae grown tank volunteering when I had a clump of algae fall from my hand and I stupidly reached quick to pick it up and got a black spine from a spiny urchin (the big guys) right into my thumb. Had to run vinegar on it for 10 minutes and it had the black hole for over a week.
I also had two cases of zoa toxin. First one dumb on my part as after working in my tank itched my eye before washing. Ouch!!!!! Two days of white vision in the eye and a couple weeks of pain. Next time, I was doing things right, but somehow the darn zoa actually managed to squirt me in the eye. I mean this thing must have taken lessons from the Kennedy assassination. The angle and likelihood was remarkable. Anyway, lost vision again for a few days and then pain for over two weeks. I do wear eyewear and gloves, so like I said crazy unlikely. I reacted immediately by a flushing of the eye, otherwise could have been really bad.
Stung by fish no. Bitten by fish, yes. Clown female.