4 dead fish at the same time same species HELP!!’

Salts155R

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This morning I’ve woke up to 4 dead cardinals at the same time.
Tetras
Lamp eye
Ottos
Plec
Clown loaches
Are all fine and seem happy, eating swimming around.
All levels are absolutely perfect.
7.0ph
26oC

no bites or bits missing.
was all swimming around last night before lights out.

just in the middle of a 70% water change in case of toxins

anything thing else I should look for
 
9 fish died in 24hrs.
Please can someone help

4 neons
5 cardinals

more fish in tank, can someone help before it’s to late please
 
We will need more info on the tank
What are the parameters? And what were the fish acting like.
 
Do you have any ammonia\nitrite in the water? Have you done a water change and forgot dechlorinator?

PH 7.0
Ammonia 0
Nitrite 0
Nitrate 2-5
KH 2 (35.6ppm)
GH 5 (89ppm)

dechlorinate with aqua safe every time

all my cardinals and neons have suffered
Lamp eye
Clown loaches
Clown plec
Ottos
Still in the tank.
Ottos are eating
Loaches don’t seem interested and neither does my lamp eye
 
PH 7.0
Ammonia 0
Nitrite 0
Nitrate 2-5
KH 2 (35.6ppm)
GH 5 (89ppm)
Temp 26c
Friday night before lights out all fine and feeding.
this morning cardinals floating and neons very slow and not eating.
tonight neons floating, clown loaches not interested in food, lamp eye not interested but swimming around like normal.
ottos and clown plec feeding away
 
Once you rule out water parameters, things get complicated.. A bacterial infection could do it, any signs of mouth/finrot or white/discoloured patches on skin? Have you added new fish recently?
 
Anything new added to the tank?
 
Once you rule out water parameters, things get complicated.. A bacterial infection could do it, any signs of mouth/finrot or white/discoloured patches on skin? Have you added new fish recently?

Nope no signs of anything like that.
a few days ago I posted that the water had white bits in it, that’s gone now although slightly cloudy (white).

nothing new added since 8th October.
 
How often do you do water changes and how much?
 
What did you do to resolve the white particle issue?
 
A bacterial infection is most likely, most other diseases don't kill fast. But its impossible to rule out contaminants like chlorine, aerosols, something on your hands getting in to the water.
Have you used any chemicals near the fish tank?
Just incase, any gulping on the surface? Oxygen deficiency is a quick killer.
 
Had nitrites rise to .5 last week so been every day 50% till Thursday when levels zeroed out. Did a 70% dump this morning incase of toxins in the water, all levels was the same as tonight.
before cleaning I wash my hands with antibacterial hand wash and hot water, dry, wash with hot water (no soap),dry then clean the tank.
 

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