Please help! Everytime I've been buying ghost shrimp, the shrimp have died and turned white. I don't have water test kit yet, but the only other inhabitants of the 5 gallon tank (5 Endler fry, <2 weeks old) are completely fine. I know ghost shrimp are less hardy than other types of shrimp, but I wanted to make sure nothing is wrong with my tank, before I attempt to put something more expensive in it. thanks for the help!