Unexpected cleaner shrimp death

[rpc07]

I came home from work today to find my cleaner shrimp dead, I've had him about 5 months and never showed and signs of illness. The only thing I can think of is I've been adjusting my kalk saturation and my tanks alk was 11.5 last weekend and now it's 9.

My current parameters.

Ph. 8.2
Amm 0
Nitrite 0
Nitrate 2-3ppm
Phos .04
Alk 9.0
Cal 420

I just did a water change last night but as always temp and salinity match.

 

[Ron Reefman]

Are you 100% sure the shrimp is dead? The first time mine molted I thought the same thing. I had a CB shrimp and when it molts, it molts EVERYTHING, even the antenna! I was broken hearted for a day until the shrimp came back out of hiding, which they do when they molt because their exoskeleton is still soft.

 

[rpc07]

Yeah I'm sure. The shrimps molts are usually translucent and this one wasn't and was fleshy. I'll keep an eye out but I'm positive it's gone.

 

[ThRoewer]

I accidently let my dosing pumps run for several hours and the pH, Alk & Ca got really high, but all my shrimp and crabs handled it well.
I found them to be sensitive to Salinity swings, but usually only when added to the tank and not slowly enough acclimated.

How about Iodine deficiency? They need that to mold.