Emergency 3 fish died last night

[MaverickReef]

I have a 125 gallon saltwater tank and last night I had 3 fish die randomly. Two clownfish and a kole tang. They showed no signs of anything on their bodies and we're eating yesterday. I did notice a few spots of ich on my foxface about a week ago but they went away and the entire tank has been eating well and showing no signs of stress. I checked for stray voltage in the tank and didn't find any with my pumps and heater on. I tested my parameters yesterday and they were as follows:

Ammonia: 0
Nitrite: 0
Nitrate: 5 ppm
Temp: 78.7⁰ F
Salinity: 1.026
Phosphate: 0.1
Magnesium:. 1350
Calcium: 410 ppm
Alkalinity: 9.5 dKh
pH: 8.3

Any idea what could have killed them? I added a Nero 5 pump over the weekend to upgrade my cheap Amazon pumps but I don't see why that would change anything. I also have a small hippo tang, foxface, firefish, and a melanarus wrasse that all seem mostly normal outside of the foxface, who looks to have a a slight white film on his belly (photo included)
Also did a 25% water change over this past weekend

 

[SlugSnorter]

I have a 125 gallon saltwater tank and last night I had 3 fish die randomly. Two clownfish and a kole tang. They showed no signs of anything on their bodies and we're eating yesterday. I did notice a few spots of ich on my foxface about a week ago but they went away and the entire tank has been eating well and showing no signs of stress. I checked for stray voltage in the tank and didn't find any with my pumps and heater on. I tested my parameters yesterday and they were as follows:

Ammonia: 0
Nitrite: 0
Nitrate: 5 ppm
Temp: 78.7⁰ F
Salinity: 1.026
Phosphate: 0.1
Magnesium:. 1350
Calcium: 410 ppm
Alkalinity: 9.5 dKh
pH: 8.3

Any idea what could have killed them? I added a Nero 5 pump over the weekend to upgrade my cheap Amazon pumps but I don't see why that would change anything. I also have a small hippo tang, foxface, firefish, and a melanarus wrasse that all seem mostly normal outside of the foxface, who looks to have a a slight white film on his belly (photo included)
Also did a 25% water change over this past weekend

Wounds or any signs of infection on the bodies? any param swings?

 

[MaverickReef]

I have a 125 gallon saltwater tank and last night I had 3 fish die randomly. Two clownfish and a kole tang. They showed no signs of anything on their bodies and we're eating yesterday. I did notice a few spots of ich on my foxface about a week ago but they went away and the entire tank has been eating well and showing no signs of stress. I checked for stray voltage in the tank and didn't find any with my pumps and heater on. I tested my parameters yesterday and they were as follows:

Ammonia: 0
Nitrite: 0
Nitrate: 5 ppm
Temp: 78.7⁰ F
Salinity: 1.026
Phosphate: 0.1
Magnesium:. 1350
Calcium: 410 ppm
Alkalinity: 9.5 dKh
pH: 8.3

Any idea what could have killed them? I added a Nero 5 pump over the weekend to upgrade my cheap Amazon pumps but I don't see why that would change anything. I also have a small hippo tang, foxface, firefish, and a melanarus wrasse that all seem mostly normal outside of the foxface, who looks to have a a slight white film on his belly (photo included)
Also did a 25% water change over this past weekend

All inhabitants eating normal this morning

 

[MaverickReef]

Wounds or any signs of infection on the bodies? any param swings?

The clowns had nothing, but the kole tang did have a dark spot on its side about the size of a dime, it appeared a few days ago

 

[SlugSnorter]

All inhabitants eating normal this morning

Wounds or any signs of infection on the bodies? any param swings?

 

[ZoWhat]

I would say it smthg involving your water change.

Was the WC water too cold going in?

Did the SG match the tank going in?

Did you let the mix settle out for a couple of hours before putting into the tank?

Milky/cloudy mix going straight in can cause chemical shock to animals

I'd investigate exactly how your WC happened

 

[SlugSnorter]

I would say it smthg involving your water change.

Was the WC water too cold going in?

Did the SG match the tank going in?

I'd investigate exactly how your WC happened

good idea, if the water change was on friday or Saturday i'd say it could be unrelated though

 

[MaverickReef]

I would say it smthg involving your water change.

Was the WC water too cold going in?

Did the SG match the tank going in?

Dud you let the mix settle out fir a couple if hours before putting g into the tank?

I'd investigate exactly how your WC happened

Water change was on last Friday, so it's been a few days but I did my normal water change procedure with 78 degree water and let it settle as well so I don't think thats it but it could have been

 

[SlugSnorter]

Water change was on last Friday, so it's been a few days but I did my normal water change procedure with 78 degree water and let it settle as well so I don't think thats it but it could have been

Wounds or any signs of infection on the bodies (THE DEAD ONES)? any param swings?

 

[Idech]

Did you perhaps vaccuum a sandbed that hadn’t been touched in a long time ?

 

[MaverickReef]

Did you perhaps vaccuum a sandbed that hadn’t been touched in a long time ?

I did vacuum the sandbed, which I last did about a month ago

 

[Idech]

I did vacuum the sandbed, which I last did about a month ago

Probably not the cause then, unless you did it really sparingly and incompletely before and did it thoroughly this time, and everywhere, and went deep in the sand.

 

[MaverickReef]

Wounds or any signs of infection on the bodies (THE DEAD ONES)? any param swings?

No, no signs of anything that I could see, only the dark spot in the kole tang but it had been there for a week

 

[brandon429]

Pull all fish


refallow tank


only add back qt fish

pass this on to every cycling reef you know to prevent fish wasting. Even clean up crews, corals, are vectors.

source: all pages of the fish disease forum


to not actively exclude fish disease day one is to invite it. Transmissible fish disease is the first suspect, not the last.

future fish will get X if not prepped. I know it sounds bleak but can we get any other takeaway from reading the disease forum for an hour

 

[davidcalgary29]

Were any inverts affected? If soft corals sulk, and some of the CUC have died or disappeared, you may have suffered a small bleaching incident. This happened to me a few months ago when I used a container for a water change that had some bleach residue in it; it wiped out two of three fish in one tank. A telltale smell in the water jug was the only clue.

 

[SlugSnorter]

No, no signs of anything that I could see, only the dark spot in the kole tang but it had been there for a week

if you still have the bodies put them in freshwater to see if anything comes out