This is my tiny desktop aquarium. All plants come from my larger tank, with the exception of one plastic plant, used to cover the small filter! I have Rili shrimp, and dwarf CPO crayfish in this tank! They seem to be doing well together so far!
I have added two guppies to the tank! Was getting little worms, from the marino ball I added recently! They were making cobwebs in the water! I cleaned the substate really well, put it all back together, and added the guppy pair! Will see what happens! They totally ignore the shrimp! One shrimp is now carrying eggs! Hopefully, there is enough moss in the back, for them to hide in! The guppies only seem to eat what is floating in the tank, not pick worms off of the substrate, unless it is very obvious! Maybe they will be ok in there! Only time will tell!
The CPO's will attack the shrimp more than likely. Definitely don't put a Betta with them, you will have no shrimp. Good luck with the guppies and the shrimp, but again, it's very probable that they may view them as food as well. Just monitor the tank, and if you see the guppies attacking your shrimp then you can address it then. Or if your shrimp population is mysteriously shrinking. Tank looks good!