I have 2 of them in my tank and they leave my clams alone. They fear nothing! An I mean nothing, the "attack" me whenever I am working in the tank. Love these little guys.
There natural diet is parasites on bigger fish, thus why he cleans my hand. I haven't heard anything about eating clams, but if he wants to take a bit of my deras, he will more then likely lose that battle lol.
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