Fast forward, I was updating my online Christmas list and was notified that someone had bought me a Marina Cubus betta kit that had been sitting on my list for a while. I figured it would be the perfect beginners Opae Ula tank as it is only 1 gallon, has a breathing hole on top, and without an unnecessary built-in filter.
I've been reading a lot of threads on this forum but I feel like some of them are really advanced. It makes me feel like I'm i over my head and I just really want to provide a happy life for the future shrimp!

My plan is:
Substrate - I was looking into Caribsea Moonlight Sand, but of course open to more suggestions! I thought that the white would make the red shrimp really visible.
Macroalgae - Marimo ball (but I heard this tends to overgrow easily and overwhelm?), do you have other suggestions?
I also wanted to put in a dead sea fan or something that they can climb around and still have lots of visibility. I really like the minimal clean look that the Ecospheres had. I'm hearing dead sea fans are essentially dead coral and can still release nitrates? I'm also reading about buffers like a limestone or eggshells? Are there other options too?
I was also unsure of what type of food. I keep seeing just plain fish flakes or spirulina?
Also lastly, snails. I know that snails can reproduce quickly as I remember them overtaking my friend's fish tank a long time ago. I've no other experience with snails but I kind of want only 1-2 snails in there, I don't want them to be very visible. Is it feasible to only have 1 snail in there? or do you recommend more? Most places are selling them in a pack of 10 and I'm scared they'll reproduce and overwhelm my tiny tank. Do you guys have any specific type of snail that is most recommended? Most snails I've seen are brown but I wouldn't mind a more colorful one if I had to had more snails in there.
I am thinking about receiving all these items together and using RO water with marine salt to start. I then plan on cycling it for about a month with the whole setup (is that sufficient time?) before I start buying shrimp. How many shrimp do you suggest? I hear up to 50 per gallon, but I'm also afraid they will start spasming and dying (from the horror stories I've read!) I am a bit tight on money but I want to be able to give them a great life without breaking the bank and I am seeing that they cost around $2 dollars per shrimp and I don't want that to be $100 down the drain because I did something wrong. The life of a poor nursing student.

Please help me, I would appreciate it so very much!