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Get a sand sifting goby (IE, diamond) because that's about the only one you'd be able to notice with 400 pounds of live rock, lol. Go for a long nosed hawk fish, too. Mine perches on my hand as I feed it shrimp, by far my favorite fish.
I guess it's kind of hit and miss. Mine doesn't even touch the things, whereas my clownfish even tries to bite my finger. Aggressive little bugger he is.
I'm sure if he was starving he'd make a go at them, but he hasn't been a problem over the last year I've had him.
any goby should be fine. sand sifting gobies are a good idea. they keep the sand bed clean and aereated. i have a pink spotted watchman goby that is a sand sifter and he lives with my pistol shrimp, also a great addition.
I have a diamond goby and he tried to carpet surf when i just walked into the house. Idk if what little moonlight that had shined in scared him or if he had been attempting to get out for a while. I heard a thud and turned on the moonlight led lightinh and there he was swimming along the top then ran back down to his cave.