So i have 2 harlequin shrimp in a 29 biocube, about 3 days ago i was doing some tank maintenance, doing water change, also decided to take some rock out. Well yesterday i could only find one of the shrimp, i thought the other one either died or was hiding for some reason, Well the day i siphoned the water out i put it in a 5g home depot bucket and threw the rock that i took out in there also, today i was finally going to throw the water out and put away the rock when i noticed that the harlequin shrimp was in the bucket there was no circulation, water was super cold and it was dirty old water to. But somehow it survived, im acclimating it as i type this to my tank again and hope all goes well when i reintroduce to the other shrimp still in the tank..