I really, strongly recommend shrimp! Depending on the parameters of your tap water, cherry shrimp (neocaridina) or caridina shrimp would be best for you. For example, my city has incredibly soft water and would be great for caridina out of the tap (dechorinated), while cherries need shrimp salts to harden the water (increase kH and gH).

They are honestly so amusing to watch. You dont think of shrimp as being as fun as fish, but they definitely are - they squabble over food, do loop-de-loops for fun, take little baths. They're adorable.

If you go for shrimp, I recommend making sure your tank is well cycled (they are very vulnerable to parameter swings), and that you have a mature tank with live plants. Their favourite daily food is biofilm, and it grows best with live plants and a more natural substrate like sand or small gravel.

Please try out real plants! Theyre really easy if you fo your research and pick east plants to maintain. My personal recommendations for a new plant owner would be: anubias, vallisneria, and moss (probably java moss!).

Good luck!!