What am I missing

[jason98]

just this past week I've lost 4 fish in my 90g and I soft coral. the tank has been running with no problems for over a year (even survived a move with everything intact) then this weekend it went bad, I lost a sharp nosed puffer (had is own section in the tank utnil I had another set up for him) and a flame angel, then last night I lost my purple tang and six line wrasse. The LFS hasn't been any help, they tested the water and didn't have any answers for me. The last tests I did came back with these readings...

Temp: 80
PH: 8.3
KH: 8.3
AK: 2.97
Salinity: 30ppm
Calc: 410

Anyone have any ideas, I'm left with a pair of clownfish, hermit crabs, and a spiny blue lobster

[Randy Holmes-Farley]

There is nothing in the tests that show a problem, but fish often die in a domino effect where one dead one releases toxins or ammonia that kill others. Maybe the puffer released some toxins?

Have you measured amminia?

I'd add some carbon too.

Do you have good aeration?