Nope, definately shrimp. carried out a 60% water change and over dosed with Prime though just in case. All the others are fine, maybe it is just down to the move they have endured recently.
Tempted to nip to MA and replace all of the P.helferi, I don't know what's up with it, it's all just slowly dying away and everything else is fine, whether or not it didn't fair her Majesty's postal system very well or not is a mystery, I am stumped.