Cherry shrimps are very tolerant, so if they are dying, there must be something wrong with the water or soil.
I have kept cherry shrimps in ph 4 to ph 8, ph is never much of an issue for cherry shrimps.
1. Isolate the cause.
Take out all the unnecessary item in your shrimp tank to isolate the cause. Leave only the substrate if possible.
2. Is your tank cycled?
Since you have another tank, i recommend you do the following.
Take out all your fauna first.
Drain all water from your shrimp tank.
Take the medium from the mature tank, and squeeze the dirty mulm all over the substrate. This will coat the substrate with good bacteria.
Also use some of the medium to put into the filter of your shrimp tank.
Hopefully, you can seed your shrimp tank rapidly with good bacteria.
I usually use inert substrate such as gravel for my shrimp tanks. Your current substrate may not be shrimp friendly, you may need to do a lot of water change to dilute those chemicals in them.
3. Water change
Do your water change 30% daily for a week, see if there are any casualty.
4. Usually planaria are quite harmless, but they can kill shrimps. I will not be too worried about them yet.
I started a thread long ago on how to setup a cherry shrimp tank in 1 day, you can reference it and see if it is useful.
http://www.aquaticquotient.com/forum...ank?highlight=
Here's another thread i started on shrimp propagation in a 3ft tank, where my 10 shrimps reproduced to the thousands.
http://www.aquaticquotient.com/forum...nce?highlight=
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