Diamond gobies do a crazy job since all day long they sift. Problem is they don't really care whats in there way, and they will move rock, or dig under rock enough so that it falls. And they are impossible to get out. I had to pull 30lbs of lr out last week to get him out. I would stay away from a diamond.
Get a yellow watchman and a bunch of nessarius snails. That combination will do a decent job and not wreck your tank.
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