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Discussion Starter #1 (Edited)
Just thought I'd post this to see what other people have to say. I've been trying to read and figure out what caused this.

A few of my fish died this past week so I did a water test to see what's up. My kH was 14+ and my pH was at 6.4. (My test kit only works until 12)

Usually my kH is about 8-10.

So I did a 7 gallon water change (21 gallons tank size) on Sat and retested my kH. It went down to 12.

I turned off my CO2 and autodoser as an experiment.
The next morning I checked my kH again and it was at 14!!!
So I did a 10 gallon change.

This morning I checked it, my kH is now 9.
The tap water kH is 7. I think my pH was at like 7.0.

Thoughts:
I starting autodosing in the end of December because I went on vacation. When I came back the CO2 was low so I turned it up for the last 3 weeks.
My CO2 is from a welding supply place. Possible contaminants?

In case anyones wondering I dose
1/4 tsp K three times/wk
Flourish half cap three times/wk
1/32 tsp N once/wk
in 3.5 cups dechlor water

5 gallon water change once a week

I usually only fill one weeks of ferts in my container for autodoser. On Sundays I clean it out and make a new batch. But last week I didn't clean out the remains in the container.
 

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Discussion Starter #3
yep red colored rocks have been in the tank for 3 plus years. new substrate is about 9 months old, previous substrate still mixed in is 3 plus years old. I have a rena xp on it also.
 

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I'm wondering if your test kits could be bad. At the first numbers you post you would have CO2 levels of 167 ppm. That would normally kill more than a few fish.

Then you state you turned off the CO2 yet your kH was at 9° and the pH was 7. That would be impossible without CO2 or some other buffer lowering the pH.
 

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Discussion Starter #5
I'm not sure. I calculated ridiculously high levels of CO2 before (RED ZONE) and none of the fish were gasping. I found it bizarre but I passed it off as my fish being accustomed to the CO2. But I am using Aquarium Pharmecuticals test kits (not exactly the most accurate things in the world...)

When I measured my kH this morning, it was 9 but I wasnt sure about the pH.

Now my kH is 10, pH 7.0. My CO2 was turned back on as of a hour ago.
 
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