When I had my freshwater fish I used to get nipped all the time. Some fish are extremely friendly. The more human contact you try to achieve with them, the more they'll get used to it. It gets to be really weird.
I was diving in Belize recently and there was a grouper that kept swimming with our group, big grouper too, about 2 feet in length. He kept going really close to us and you could literally pet him. Both hands and all, one on each side. And he just kept on coming for more.
It's quite strange when you start running into this stuff in the wild, it really shows how much human contact fish actually manage to get from divers. I guess with a fish of that size, your hand is like a large cleaning station, scraping some stuff right off the side of their bodies.
My clownfish are finally feeding off of my fingers when I hold the food. But if I stick my fingers in there, they go away.
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