Bettas can be hit and miss with stuff. I have one that doesnt bother RCS but the minute you put a chocolate or black emerald in there he hunts it without any remorse. No idea why. He also leaves the false amanos and natural type NEOs alone. He will also eat chilli rasboras.
You could also wind up with one that likes shrimp as much as pellets. Wont know until things get settled.
As far as fish, if you have some plant and hiding cover you can do several small fish. Ones I have with reproducing shrimp are 40breeder - false juliis, otos, CPDs, ember tetras, and at one point chilli rasboras 10gal- betta, couple male guppies, couple beckford pencil fish, otos.
The 10g got some culls from the 40B because I had so many and figured why not, went from about 5-6 to about 15+ currently.
If the name of the game is getting alot of shrimp forgo the fish besides the otos. If you just want a decent colony of shrimp then add what ever small well mannered fish that cant fit adults in there mouths. They will eat some of the babies but if there are plants like java fern or moss or some other dense plant some babies will survive.
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