Fish and Shrimp dying?

[MrX1oo1]

Just bought a six line wrasse and a cleaner shrimp and they've dissapeared. Not sure what could have killed them? heres my parameters today:

Temp: 80.7
Ammonia: 0
Nitrates: 0
Nitrites: 0
pH: 8.2
Alkalinity: 5
Salinity: 24
SG: 1.018
Phosphates 0
Mg: 1230ppm
Calcium: 400ppm

I know my SG is a bit low, I'm working on slowly correcting that. Could that be the killer? I also dose Iron once a month for my mangroves and Chaeto. I have a small skimmer and I run carbon, phosban and purigen. My two clowns, mandarin and all my coral are doing great. Is there something I'm missing here? thanks in advance!

 

[NYCBOB]

why is your sg so low? improper acclimation or unreliable lfs could also be the cause.

 

[MrX1oo1]

I was using one of those crappy floating hydrometers, I have a swing arm that I've never used till today. Going to have to start using that one now that I realized it was way off. The shrimp was probably too sensitive to the change in SG, are six lines pretty sensitive to that as well?

 

[NYCBOB]

Try investing in a refractometer. It runs about $40.