PH not stable-help?

beagle

Hello, I have noticed that my 75 gallon tank is having an issue with PH staying stable. It seems like it’s about 6.8-7 after a water change then it seems to drop to 6 not long after, and yes I have lost some fish-mostly newer fish. My older fish seem to be doing fine. I’m using API freshwater test kit. After some looking online I read Kh and Gh may affect this but I used tetra test strips which I know are not the most accurate and it said I had soft water but ideal Kh, but don’t know accurate this is. Is there any way to safely adjust my PH so it stays stable. I currently have fish and live plants in my tank. My tank has been cycled for years.
In addition I have read that crushed coral can help. If yes how much do I add I wound prefer to use in my HOB filter if possible. In addition, if that is not the problem will adding crushed coral cause a problem? I have also been battling high nitrates levels for a little bit-doing after changes but it’s a slow process. I left a caretaker in charge of feeding fish when I went away for a weekend and they majorly overfed and I had some live plant death, but that didn’t cause any fish loss, that was a few weeks ago, so I’m not sure if the nitrates are the problem or if it was the PH swing-looking up symptoms it appears the fish were showing more signs of PH shock then nitrate poisoning. My nitrate level currently-which is due for a water change today is about 40ppm with api liquid test kit. I know it’s high and I’m trying to adjust it with water changes as stated above.
In addition I’m also not sure if the nitrates could be causing the ph fluctuation.
 

FishDin

The tank has been cycled for years. Is the pH issue new or has it always done this?
 

beagle

The tank has been cycled for years. Is the pH issue new or has it always done this?
PH issue is new.
PH issue is new.
They only thing I can think of that is difference is we had a new water softner system put in last year. But via my test kit it has neutral ph, 0 ammonia, 0 nirates.
 

jtjgg

the water softener should have a bypass so you can get the regular tap water. or use the outside water hose to refill. that's what i do, we have a water softener.
 

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