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For a couple of days my watchmen goby has been building or digging a new home, last night I was shocked b/c a pistol shrimp which I put in about 6 months ago appeared with it. I was certain was dead or eaten as I haven't seen it since.
Over the past several onths my pistol shrimp has become more brazen. He comers out more often, of course with the goby right on him. Post a pic when if you can.
We have had pistol shrimp do the same thing. When we moved our 20g we found 2 in there that we thought were dead and had been replaced (so we found 3 total). I hear you with building right next to a place where you can't see them.