many cleaner shrimps die due to sudden intro to tank. usually its due to
PH, and salinity shock.
some LFS had ever exprience 100% casualty due to this reason.
packaging water from overseas have very high salinity and low PH.
shrimp's own body waste lowers the PH in the small pack of water over 2days.
therefore when buying live stock that's still in the shipment packaging, u got to be extra careful.
also shrimps are very sensitive to ammonia, nitrite and nitrate.