[Emergency] Small PH swing, fish possibly dead or dying??

[Rocky998]

My PH is normally 8.1. My peacock gudgeons have always been happy in this water and have even had successful fry.
With my KH also being high, I decided that maybe I could add in tannins to help with something bacterial happening to my corydoras without altering the PH.
After about 2-3 hours of doing the water change I decided out of pure curiosity to test the PH and it came back as being around 7.9 being my best estimate.
Then I check on my fish now and my peacock gudgeon (the one I literally raised from birth), went from looking a bit lethargic to looking like she wasn't even breathing...
I'm gonna wait until morning, but a shift of like 0.2 shouldn't cause a DEATH, right!?

I'm emotionally attached to her! I raised her! I'd be so sad if she passed!!

 

[CassCats]

Not enough to cause anything. Especially over time.

 

[TNG]

My PH is normally 8.1. My peacock gudgeons have always been happy in this water and have even had successful fry.
With my KH also being high, I decided that maybe I could add in tannins to help with something bacterial happening to my corydoras without altering the PH.
After about 2-3 hours of doing the water change I decided out of pure curiosity to test the PH and it came back as being around 7.9 being my best estimate.
Then I check on my fish now and my peacock gudgeon (the one I literally raised from birth), went from looking a bit lethargic to looking like she wasn't even breathing...
I'm gonna wait until morning, but a shift of like 0.2 shouldn't cause a DEATH, right!?

I'm emotionally attached to her! I raised her! I'd be so sad if she passed!!

I suspect that you inadvertently introduced something into the tank with the tannins. The small change in pH is not the problem.

 

[MaloK]

How is your peacock doing ?

 

[connorlindeman]

.2 Ph is not going to cause death. Assess what other changes have been made.

 

[Rocky998]

Not enough to cause anything. Especially over time.

Yeah... well I boiled the leaves to instantly get tannins, let the water cool, and then slowly added it to the tank along with the leaves...

Only 2 leaves were not boiled and just weighed down with a rock. Although I did rinse them under tap water.

I suspect that you inadvertently introduced something into the tank with the tannins. The small change in pH is not the problem.

That would absolutely suck... but it's weird. Everyone else is A ok (all things considered)... but of course my fish that I raised from birth gets hit with whatever is happening.

Don't know what they could've gotten from it after I boiled most of the leaves (besides two which I rinsed under tap)

How is your peacock doing ?

Well looks like she moved to a spot that wasn't too far away, but she looks exactly the same as last night... No visible breathing, but she hasn't rotted and the corydoras would've eaten her partially if she was dead.
Although now saying that, I see something below her stomach I can't see much. I might try to get something long to shift her position as gently as possible to see it

.2 Ph is not going to cause death. Assess what other changes have been made.

Literally nothing. I did the water change, put the amount of salt in to replace the salt taken out by the water change.
Only new thing is the Indian almond leaves