Hey, I might recommend having guppies or similar fish, they are shoaling fish and would work very well in your tank. It’s roughly 1 gallon per fish but if you are planning to keep some babies leave room for them to grow x
When I had my fry I put them In a smallish separation tank in my main tank while they were small. This was to easily keep the water fresh without having to change it. Because a lot of mine survived, when they got bigger I moved them into a 10 gallon tank once they got to a size I positively knew...
You shouldn’t worry at all but I understand why your paranoid cause I am to about small things too!
If your tank has a lid they won’t be able to jump and if the tank feels unstable/wobbly then I would change the stand but if not it’s fine xx