Sunday afternoon I picked up 2 false perc's and a cleaner shrimp for my 55ga. Sunday night about 5 hours after going to the pet store the shrimp was dead. The 2 perc's are fine and I am really confused to why the shrimp died. All my levels are correct in the tank and the SG is at 1.023. I am going to call the shop in the morning to see if they will replace the shrimp but I think the guarantee is only on fish.