Mysterious disease

[KrazyKuch]

I must have some strange disease in my fish tank but I don't know what it is!!!

The last week I have lost 3 fish, to unkown reasones. Today being the most recent, I woke up this morning and all my fish seemed fine got home from work and my Lemon Peel angle is dead lieing on the sand....She had no wounds no visible disease just dead.....Did water tests last night and everything was fine except for nitrate which was at 20ppm (also have a little cyano), so I did a 20g water change.and I just checked the water again and same thing everthing fine except for nitrate which was at 10ppm.

What could be killing my fish????

[tbone]

could it be copper?

[TheReefGeek]

Did you just do a water change or anything?

[Ruth]

What are your other readings? Have there been any swings in PH or temperature? Anything else that might have suddenly changed? Any new fish or inverts added?

[michika]

We've never treated copper in our tank.

Most recent fish added were a foxface, and a male mandarin. The male mandarin passed away yesterday, Thursday. The Signapor Angel died on Monday, and today, Friday my Lemonpeel was gone.

All readings are normal
SG at 1.024
pH 8.2
Alk 9dkh
Ca 400
Nitrate 10ppm
Nitrite 0ppm
Ammonia 0ppm
phosphates were 0.25
All water changes etc is done with RO/DI

All our corals are starting to flourish again, all the polyps are out and extended. Figures, I have a bad rash of coral die off in which I lost 90% of my corals, and now my fish are dropping off.

I wonder if a lack of cleaner shrimp could be contributing? We've always had cleaner shrimp until about 2 months ago.

[KrazyKuch]

Kinda like an update but, we have lost 2 more fish....We lost our big Tomato clown and we just lost our other mandrin Goby.....Both of which have died after adding the cleaning shrimp...

Could our Fox Face be killing our fish??