try seachem 7 regulator, crushed coral, egg shells, tufa rock, ultimately get rid of the ada soil and get something else as it will be a constant battle for you, every time you add water it will spike the ph higher and then it will lower itself again due to the ada, you will continue losing shrimp and why make it harder then it should be? takes away the fun. or get rid of the cherries and get something else that benefits from the lower ph.