Betta Fish: 25L Betta setup! What am I missing before adding him?

I’m setting up a 25L Betta tank and wanted to check that I’ve got everything covered before adding the fish.

The tank has a filter aimed at the surface for a gentle ripple with minimal current, an adjustable heater and thermometer, and I’m using water conditioner and a liquid test kit. Tanks a bit cloudy because the sand was a bit cheap and rubbish and went cloudy even after cleaning, but nothing some aqua clear won't fix.

For plants, I’ve got Anubias, an emersed Anthurium, and Salvinia floaters. I’m planning to add oak leaf litter for tannins and a more natural look, and I’ll be adding a small cave or resting spot soon, although I believe a betta would rest on the Anubias also?

An acrylic lid is on the way. I’m running a DIY CO₂ setup for now but plan to remove it before introducing the Betta. The tank’s fully cycled and parameters are stable, been testing and ghost feeding.

Any suggestions or refinements before I bring the Betta home?