HELP: large fish die off no idea what happened

[sfp2002]

Just when you think you have this all figured out..... boom something happens.

So I had a large fish die off last night I lost 2 blue damsels, a foxface, and a fairy wrasse that have been in the tank almost a year.

The only thing I have done or added was a colorado sunburst bubbletip anemone last Tuesday.

I have 4 peppermint shrimp, 1 fire shrimp, lots of snails, 2 clowns, 1 firefish, 1 banggai that are all surviving though they look alittle stressed.

Temp. 78
Salinity. 1.026
All. 10.2
Ph. 8.0
Nitrate. 1
Phosphate. .04
Ammonia. 0
Nitrite. 0

Can't figure this one out

The nem was very bloated and exposed out of its hole with the lights out. So my first thought is it died so I turned the lights on and it reacted to the lights then I dosed seachem prime as a precaution. I poked the nem and it reacted slowly but now looks as pictured.

Any suggestions are appreciated I don't want to lose everything but dont want to lose an expensive nem either. What could have killed so many fish but not others or inverts. I lost no inverts.

Lfs said the nem was alot larger but picked this rock to live in.

 

[Garf]

Just when you think you have this all figured out..... boom something happens.

So I had a large fish die off last night I lost 2 blue damsels, a foxface, and a fairy wrasse that have been in the tank almost a year.

The only thing I have done or added was a colorado sunburst bubbletip anemone last Tuesday.

I have 4 peppermint shrimp, 1 fire shrimp, lots of snails, 2 clowns, 1 firefish, 1 banggai that are all surviving though they look alittle stressed.

Temp. 78
Salinity. 1.026
All. 10.2
Ph. 8.0
Nitrate. 1
Phosphate. .04
Ammonia. 0
Nitrite. 0

Can't figure this one out

The nem was very bloated and exposed out of its hole with the lights out. So my first thought is it died so I turned the lights on and it reacted to the lights then I dosed seachem prime as a precaution. I poked the nem and it reacted slowly but now looks as pictured.

Any suggestions are appreciated I don't want to lose everything but dont want to lose an expensive nem either. What could have killed so many fish but not others or inverts. I lost no inverts.

Lfs said the nem was alot larger but picked this rock to live in.

Are your circulation pumps working ok? To be honest I get a bit of a twitchy butt when I see temperature probes with them sticky suckers on them, I've got mine cable tied to rocks to stop them going airborne.

 

[Gregg @ ADP]

Lot of coral/nem extension and multiple dead fish typically points to low O2.