Total wipeout- ALMOST

[MartyG]

The last fish died today- a total wipeout.

I tested the water (my test kit may have expired date?)

Ammonia-07ppm
Nitrate -157ppm
Nitrite-07ppm
PH 8.6 (a bit high!)
Dissolved Oxygen-7ppm

I'm thinking some kind of contaminant?
High co2 (PH) as a result of equipment failure?
I plan to do 50% change on (no fish) water.

Any other ideas?

-Martyg