During the adding of freshwater to fill up my 5 footer, saw a hitchrider - a normal pistol shrimp(carrying eggs somemore) that came running out of the liverocks. I thought it will not survive the 2 hour freshwater dip before i addded salt to the tank. Today, after 4 days, i saw it digging a hole at the side of my left tower. Hope it will survive the cycling period and it be will become my first occupant of the tank.