Not to be critical but this tank is overstocked. A 5.5 gallon is pretty much the minimum size for one betta… a school of cardinals, platys, frogs, kuhlis is going to produce a huge bio load and result in stressed animals. I’d move the frogs, platys, and kuhlis to at least a 10 gallon. Then, if terms of shrimp, I’m a sucker for classic cherries 🙂
Yellow neos are my fave, males and females look gorgeous due to the yellow stripe… pretty much any grade looks gorgeous as well, I find- mine were just from a chain LFS.
TemporaryMeat4369 
get red. you’ll have a hard time enjoying blue with black substraye
Idk why but I am really in love with blue jellies. When they are berried they look insanely cool
Red and yellow. Blue but better if its on a lighter substrate
Not to be critical but this tank is overstocked. A 5.5 gallon is pretty much the minimum size for one betta… a school of cardinals, platys, frogs, kuhlis is going to produce a huge bio load and result in stressed animals. I’d move the frogs, platys, and kuhlis to at least a 10 gallon. Then, if terms of shrimp, I’m a sucker for classic cherries 🙂
Red
I just buy a skittle pack. Now I’m pretty sure they get jiggy in the plants. I keep seeing new shrimplets around.
red ones will surely pop off in a dark substrate!
I agree with all, red.
id suggest fixing your fish stocking before you get any other animals
https://preview.redd.it/bgfxr0py6idd1.jpeg?width=1306&format=pjpg&auto=webp&s=9f03bf4256be9d96fdf7b6b6598c1fd305427eed
Red Pinto Galaxy
At least these are the ones i want to get, didnt have the money yet but i have a 120l Tank set up for them
Yellow neos are my fave, males and females look gorgeous due to the yellow stripe… pretty much any grade looks gorgeous as well, I find- mine were just from a chain LFS.
https://preview.redd.it/bnd6nl4k9idd1.jpeg?width=3024&format=pjpg&auto=webp&s=ef59f003facd950d2dd49a56e225e5ddc547a820
PURPLE