Id suggest avoiding using RO, it really isn't necessary for a large majority of hobby fish including cories and neocaridina shrimp.
RO just makes life harder.
I'd only recommend it for specialist fish or specific breeding etc such as wild fish, caradina shrimp, discus etc... so many run of the mill fish are tank bred and adaptable to most waters.
You could look at apistogammas for a feature fish/pair. Again if tank need they will be happy and even breed in hard water but you will lose some shrimp as snacks so establish a population first...
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RO just makes life harder.
I'd only recommend it for specialist fish or specific breeding etc such as wild fish, caradina shrimp, discus etc... so many run of the mill fish are tank bred and adaptable to most waters.
You could look at apistogammas for a feature fish/pair. Again if tank need they will be happy and even breed in hard water but you will lose some shrimp as snacks so establish a population first...
Sent from my SM-G950F using Tapatalk