Cory lying on its side

I recently got 4 new corydora and one of them after a few days started lying on its side. I don’t know if it’s going to die I need help with this since I really don’t know what the problem is. It still seems to be alive since it’s gills are active
Water parameters:
Ammonia:0ppm
Nitrite:0ppm
Nitrate:8ppm
pH:6.8
Temp:28c

 

Your water parameters look ok. Have you noticed any odd behavior from your other fish? Also, I would double-check that's it's alive. A dead fish needs to be removed immediately.

 

I recently got 4 new corydora and one of them after a few days started lying on its side. I don’t know if it’s going to die I need help with this since I really don’t know what the problem is. It still seems to be alive since it’s gills are active
Water parameters:
Ammonia:0ppm
Nitrite:0ppm
Nitrate:8ppm
pH:6.8
Temp:28c

Temp seems a little high for corys. How is the circulation and aeration in your tank? Could just be the adjustment was too much. From the photo I don't see any outward signs on disease. Could also be a swim bladder issue.

 

Temp seems a little high for corys. How is the circulation and aeration in your tank? Could just be the adjustment was too much. From the photo I don't see any outward signs on disease. Could also be a swim bladder issue.

Sadly this one had died and a few days later another one had also died. I have an air stone and a few plants and I can do little to none to try to cool down the tank as I live in a very hot region of Australia and cannot afford a chiller .When I purchased them from the store the lady said they had arrived that exact day. I really don’t know the reason of death but my original 2 albino Cory and sterbai are doing Fine while 2 of the new corydora have already died within a week or two.

 

It isn't the temp.

 

It isn't the temp.

I have to agree here, I do not think it has anything to do with your temperature. I have two Albino Corys in my aquarium and my temperature is about the same as yours, they are happy and healthy.

I originally had three but one died the day after I brought them home, yet the other two are thriving.

Sometimes we just get a fish who is already sick, or sometimes they just don't make it despite our preparations for them, due to stress or not acclumating, or other factors beyond our control.

 

I have to agree here, I do not think it has anything to do with your temperature. I have two Albino Corys in my aquarium and my temperature is about the same as yours, they are happy and healthy.

I originally had three but one died the day after I brought them home, yet the other two are thriving.

Sometimes we just get a fish who is already sick, or sometimes they just don't make it despite our preparations for them, due to stress or not acclumating, or other factors beyond our control.

By far 5 fish have died in my tank since I added the additional 6 albino, idk if I’ve introduced a parasite in to my tank or something but fish have been dying one by one. 3 albino Cory and 2 balloon Molly have died. I’ve been doing frequent water changes with the deaths but they still happen. I’m really lost on what I should do about this since I don’t know the cause.I really need advice because I fear all my fish will die.
Water parameters:
Ammonia: 0ppm
Nitrite:0ppm
Nitrate:11ppm
Temp:27c

 

Could you complete the emergency template to give a full overview of your tank.

Might help to see what issues there are.

 

Is the filter running well? what are you feeding?

 

Could you complete the emergency template to give a full overview of your tank.

Might help to see what issues there are.

Tank
What is the water volume of the tank?:
127litres
How long has the tank been running?:
10 months
Does it have a filter?
Yes
Does it have a heater?
Yes
What is the water temperature?
27c
What is the entire stocking of this tank? (Please list all fish and inverts.): 2 balloon mollies, 3 albino corydora and a sterbai corydora

Maintenance
How often do you change the water?
Every Saturday
How much of the water do you change?
25-30%
What do you use to treat your water?
API stress coat
Do you vacuum the substrate or just the water?
I sometimes vacuum the substrate but most of the tank has fluval stratum so I can’t vaccum

*Parameters - Very Important
Did you cycle your tank before adding fish?
Yes for about 2 months
What do you use to test the water?
API test kit
What are your parameters? We need to know the exact numbers, not just “fine” or “safe”.
Ammonia:0ppm
Nitrite:0ppm
Nitrate: 11ppm
pH: 6.8

Feeding
How often do you feed your fish?
Every day and fast them for 2 days a week
How much do you feed your fish?
A few tiny floating pellets about 6 or 7 pellets and one sinking wafer for corydora
What brand of food do you feed your fish?
Pisces flakes and pellets and hikari sinking wafers
Do you feed frozen or freeze-dried foods?
No

Illness & Symptoms
How long have you had this fish?
The 3 new corydora I had for about 2 weeks till they died only one new corydora is alive now and the 2 balloon Mollies that died I had for about 3 months
How long ago did you first notice these symptoms?
The balloon mollies died out of nowhere I didn’t see any noticeable symptoms but I did notice one of them had white poo after a few weeks from giving birth. The corydora on the other hand were swimming frantically for a few days. I thought this was just due to stress from getting a new home so I thought it was normal but 2 weeks later 3 of them had died
In a few words, can you explain the symptoms?
Have you started any treatment for the illness?
No because I am still trying to find out the cause of their deaths
Was your fish physically ill or injured upon purchase?
No although the corydora were freshly shipped in and were probably highly stressed but that doesn’t explain the balloon Molly deaths
How has its behavior and appearance changed, if at all?
No the behaviour of the balloon mollies were not out of the ordinary they were eating fine and just doing their thing, the new corydora were glasss surfing and seemed to be stressed but I thought they were just adjusting.

Explain your emergency situation in detail. (Please give a clear explanation of what is going on, include details from the beginning of the illness leading up to now)
I purchased 4 new albino corydora and suddenly fish start to die I don’t know what the cause is since they have no visible sickness to them although the white poo might’ve been parasites but I’m not sure since it was only one fish had white poo and the others had brown. I’ve been monitoring the surviving fish and none of them have white poo. All the fish that had died didn’t seem to be bloated or have sunken bellies.