Help! Total crash!

[Just a Wrasse.]

This morning, what do i see, my two clowns, dead, my fire shrimp, dead. My gobie and snails, alive. My kh is really high, is this why my fish died? did an ro water change.

parameters:

n03: 5ppm
Ph: 8
Kh: 17!!!

Help!

Thanks,
Stan

 

[Doctorgori]

I’m not sure the alkalinity killed the fish, corals maybe…
any signs of coral death? Ammonia chain reaction?

 

[Glenner’sreef]

Do you dose Alk? Faulty Doser may have dumped too much???

 

[MaxTremors]

Need more info to try to deduce what happened.

 

[Unitylover]

I think its the corals, as ded corals = beeg ammonia

 

[Klyle]

Sounds like you need to get that alk back down! I'm curious if you would want to slowly lower the alk or get it back down quick. Idk I'll be following along for better advice but, to me at least, this seems like one of those rare reefing instances where quick action is necessary.