Half my fish died

[Jmas4]

Help! Half of my fish died. I went snowboarding today and now I came back and I found my fish dead. Water quality has been great for months. Ammonia is 0 even after their deaths. I belive they died last night because I hung nori this morning and it has been un touched. I could not see the dead fish this morning because it was dark when I left to go snowboarding. Please help.

 

[Jmas4]

Temps were 78.4 constant and their was no power outage

 

[Duke4Life]

Help! Half of my fish died. I went snowboarding today and now I came back and I found my fish dead. Water quality has been great for months. Ammonia is 0 even after their deaths. I belive they died last night because I hung nori this morning and it has been un touched. I could not see the dead fish this morning because it was dark when I left to go snowboarding. Please help.

When was last wet thing/fish added?

 

[Duke4Life]

Have you checked for stray voltage? Heater issue?

 

[Jmas4]

The last fish or thing added was more than a month ago. No ich

 

[Jmas4]

It is not stray voltage all corals and few fish are still alive

 

[jsker]

how do things look now?

 

[Jmas4]

My sailfinal tang yellow ,powder blue, nasotang died. Also coral buety angel six line wrasse and 2 chromis. 2 clownfish 2 damsels and a hoevens wrasse is alive. To give you a idea.

 

[Duke4Life]

It is not stray voltage all corals and few fish are still alive

How are these fish acting? Voltage can affect everything differently.

 

[Jmas4]

Things look ok now

 

[Duke4Life]

What type of filtration?

 

[jsker]

post a picture please.

did it cold all of a sudden?

Could it be CO2 build up?

 

[Jmas4]

The live fish look as if nothing happened clownfish are hosting and damsels are chasing as usual. All the coral is fully opened

 

[Duke4Life]

Keep an eye on ammonia, that many at once could raise it. Sorry to hear this.

 

[Jmas4]

It is sump filtration with sock and reactor and refugium no skimmer never had a need

 

[Jmas4]

Ammonia is zero I just checked

 

[Jmas4]

We did have a cold night but there was 3 heaters in the tank. I forgot to add a mandarin survived if that makes a difference

 

[jsker]

Wow nice setup, the reason I was thinking Co2 was you said that you went snowboarding. My thinking was it cold and the heat kicked in. what type of heat?

 

[jsker]

We did have a cold night but there was 3 heaters in the tank. I forgot to add a mandarin survived if that makes a difference

the heat that is heating the house?

 

[Duke4Life]

Thats what's got me scratching my head, its a nice setup. And no tell tell signs from anything else. Was thinking possible toxin but no way after seeing your pic.