Welcome to the forum; you have found a good place.
Your tank looks pretty nice as to a basic setup but, still, for a healthy tank, I would have to suggest that you get some live plants. To be honest my current tank is my first fully live plant setup and I'm happy I did it.
We started with plastic plants and bright blue and green stones, my 7 year old picked a goldfish.. 18 months later and we’re starting again… staying away from gf too..
The plants in my tank don’t need co2 or anything special, I’ve just stuck them in the gravel and they’re all ok, I gave them root tabs after three weeks.
Soak the plants before adding them to the tank so you don’t introduce any snails etc..
They also speed up the cycling process too
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I added some live plants and a few more bits. Cloudiness only cleared today but I’m pretty happy with how it’s looking. Can’t wait to get some fish once all the levels are perfect.