Yep if you want a goby that will sift all day the diamond goby is the way to go. I have both a watchman goby and diamond goby. The watchman will just sift right outside his cave. The diamond moves sand all over.
Sometimes it gets annoying as it will cover the bottom corals with sand. However the sand always has that new appearance which I like.
You just have to make sure that your live rock is resting on the bottom of the tank so moving the sand around it will not make it fall.
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