How many fish for a 15L tank? and Betta Vases?

I'm thinking of getting a Baby Biorb 15L.
But, i've looked on the internet and it says, for example, for tiny shoal fish there must be a minimum of 6 fish but for 15L i can only have a max of 2....surely that cant be right?

Is there a way to mix and match between a Betta fish, those tiny neon fish (tetras?), Guppys, Ghost Shrimp, and generally interesting fish? (perhaps clams to..)

Plus, i've heard about Betta vases. I dont really understand. Why marbles at the bottom, not gravel? Why a massive flower stuck in the middle? ect.
I've read it must be a quart in size. (1.13652297 litres) Can you get vases in that size? How do you turn it into a lovely Betta home?
Thank you for taking the time to read this and for your help. x
 
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