Here's me 'snorkeling' with a bunch of cichlids in god's fishtank, Lake Malawi, in 2005. Your photo reminded me to go back and check my old photos, which has been a fun experience. They were everywhere. This was in a nature reserve part of the lake, and the fish were completely unafraid.

Also, I discovered that I'd picked up the parasite Bilharzia doing this when I returned to Sweden. First case in 25 years they told me. Fortunately, it's easily treated by medication if discovered before major organ damage occurs.