What Happened To My Fish Tank!

[madjoker14]

I'm extremely sad, I went to visit a friend up in Canada and when I got home today to do my weekly 25% water change I find that all my neons are dead (6 of them) 2platies had passed away,

2 other platies seem to be doing fine and 1/2 Cory catfish can't stay at the bottom! It's like he can't sink down, maybe his bladder... Idk.....


I ran a test as I'm so frustrated to see this, iv had the neons now for about 3 years and they are all gone.....

Any ways,
Ammona is 0
Nitrite is a little elevated as it's .25ppm
Nitrate is 10ppm (which has been normal)

My heat seemed to raise up as it was up to 82-86 degrees, dam thing is so old...

Idk guys, what could you tell me here, I'm so devastated by this...

 

[This Old Spouse]

The heat would do it, as the more heat the less oxygen. The cory at the surface is a bad sign.
 
Do a very large water change, and use slightly cooler water. Don't want to shock the ones that are left.

 

[Mamashack]

That's so sad joker! Sounds like you need to put a new heater on your shopping list.

 

[madjoker14]

Is 82-85 degrees that much hotter or is there anything else that I could be over seeing.

What could cause such a massive spike in death... Because I though tropical fish couldnlive in like 90 degree waters

 

[Lunar Jetman]

Is 82-85 degrees that much hotter or is there anything else that I could be over seeing.

What could cause such a massive spike in death... Because I though tropical fish couldnlive in like 90 degree waters

 
I think you'd struggle to find fish that would survive in 90 degree waters!
 
Tropical temperatures are around 75-77 degrees with a few fish preferring slightly higher temperatures of 80-82, like Discus fish. Neons are also fairly weak these days due to a lot of inbreeding so any minor changes could spell disaster.
 
We can't be sure 100% that the higher temperatures are the root cause here but there is a strong suspicion that this is the case. I'd lower it to 76 degrees, changing some water and see how things are.

 

[madjoker14]

I dropped down the temp to 74-76 and my 2 Cory are acting like normal, they are both swimming at the bottom of and not the top, eating and the 2 platies that survived are eating again and doing fine e...


U take ur eyes off for 1 day and all he'll breaks loose =(

 

[This Old Spouse]

Glad they're better.

 

[Lunar Jetman]

I dropped down the temp to 74-76 and my 2 Cory are acting like normal, they are both swimming at the bottom of and not the top, eating and the 2 platies that survived are eating again and doing fine e...

Good to hear things seem to be getting better.

U take ur eyes off for 1 day and all he'll breaks loose =(

Don't you just love auto correct....

 

[eaglesaquarium]

Is 82-85 degrees that much hotter or is there anything else that I could be over seeing.

What could cause such a massive spike in death... Because I though tropical fish couldnlive in like 90 degree waters

 
 
Yes, 82-85 degrees can be fatal for many tropical fish, if it is for a prolonged period of time.  Some (certainly not all) tropical fish can survive 90 degree temp water for very short periods of time, but it is VERY short.   Neon tetras are a fish that must stay in the cooler water.
 
I've seen multiple top temps for neon tetra from reliable sources.  The lowest I saw is 74F, the highest is 82F.  So, keeping the fish in the 85F range (perhaps even higher) is a major issue for them, so its not surprising that they all died.   if the heat was the issue, it would be an issue for all of them.