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One by one shrimp dying

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So I have a 10-gallon tank that's been set up for over six months.
Lately, I've been having one cherry shrimp die a night for the last 5 ish nights.
My tank is planted, Fluval stratum and usually it kept my ph around 6.4 but lately my ph is testing around 5. GH is around 75 ppm, Kh at 0 (because of the substrate)
No nitrites, almost no nitrates, and 0.3 ammonia. I run low co2 to keep the plants growing 1 bubble every 4/5 seconds.

I am not sure if it's the ph and slight ammonia that's now showing up, that's slowly killing the shrimp. But I had them in the tank for weeks before this started happening.

Is there anything I can do to save the rest of the shrimp from dying off one by one? I have tried to investigate why they're dying off and haven't come up with anything.

I have another tank that runs the same in a 5 gallon and haven't had any losses of yellow neocardina's that I have. The only difference between the two tanks is which plants are stocked.
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Ammonia in a shrimp tank is infinitely more toxic to them than water hardness (though it definitely should be a degree or two higher at minimum) or trivial CO2 and oxygen levels.

If the only difference between the two tanks is ammonia levels, that's where you should start. Dose Prime and get to the bottom of what's causing slight ammonia spikes. If that doesn't solve the problem, move on to the next possibility. But always start with what's most potentially problematic.

Note: Some will suggest ammonia/ammonium isn't as toxic in more acidic water but that's just not the case with shrimp. Even pockets of ammonia - say, in recently disturbed substrate - can be toxic to shrimp in the area until it fully dissipates and is processed.
 

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The types of common nitrifying bacteria present in in tanks like this don't die off (or stop working) as a result of pH changes or even sudden pH swings. They aren't even impacted much in terms of kH flux - just takes a while for them to get colonized. But once they're there? They're there and adaptable.
 
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