Whatever aquarium type it might be, fish only or reef, large or nano, aquarists put their hands into the seawater.
Maybe a rock is out of place and needs to be adjusted, or a coral is crowded and needs to be moved. Perhaps the aquarist is having a war with aiptasia anemones and is in the middle of one of the skirmishes. Or perhaps a life form of some description is being removed.
Care is always needed, though for the most part all is usually well.
Click on the link below and have a read of one aquarist’s experience with what seemed to be innocent…