yes I do the cherries / neocaridina for sure, theyll reproduce in that by hundreds over time
the fancy crystal reds on youtube want to be in detritus-free systems.
nitrite is incredibly impactful in freshwater, more than ammonia, and I bet accumulated mulm like what any planted tank has is leaking some nitrite and it kills the weak crystal reds.
on youtube they're in very basic systems, epoxy gravel etc and soft water but its the waste pellets that are kept clean, no uneated food, low protein feed and high plant matter specifically translates into less nitrites because those must originate either from direct metabolism or by breakdown of proteins.
I have planted tanks that I dont want to keep super clean of mulm, so I do cherry shrimp and they dont care