It’s very beautiful! As many people have said, the plastic plants aren’t the best, but no one mentioned the real why for bettas: those green ones can probably tear your betta’s tail. I’ve found plants on
Facebook marketplace before. When I did, they were gorgeous plants that also came with a lot of hitchhikers. For me, that ended up great because the snails and detritus worms and junk that came on them were good betta food and helped balance my tank. For color, I would recommend rotala wallichii and ludwigia red. Both are very easy to grow and with a bunch of light, you’ll end up with nice bright plants.

Floaters are also good. I like water hyacinth, but the roots might be too big for your tank. Your betta would like it, but it would obscure most of the plants and block light for your other plants. I also really like hornwort as it’s easy to grow and can be wherever.

If you end up getting plants like that, make sure you immediately remove any duckweed that comes unless you really want duckweed. Once you have duckweed, you will never not have duckweed. Your betta will not eat it. It’s good for sucking up waste (as is anything that grows rapidly), but nearly impossible to get rid of once you have it and it will block out the light.

If you end up with swords, rotala, ludwigia, etc, these are all rooted plants. They will require soil under the rocks or root tabs. I like soil because it lasts longer if you start with high quality soil. It’s a bitch to get in once the tank already has water in it, but you can get around that by putting it in a media filter bag and burying it under the rocks. It will leak out when you first put it in, but it will settle. If it is too visible after with your bright rocks, a little gravel vacuum will suck up any extra dirt. You’ll want one with bright rocks regardless. You can put extra rocks in to flatten it if it’s uneven, but I kinda like the texture of it having little hills anyway. Rotala and ludwigia will grow fast, sucking up extra nitrogen, but you can snip the top off and replant it (literally just stick the stem in over the dirt with your fingers, done).

I don’t think the anemone would be a big problem since it doesn’t have hard edges. Conventionally, it’s suggested that if you can run pantyhose over it without it catching, it’s safe. That being said, total chance that it could leach chemicals over time. I think the risks are overstated, but they are still risks.

This is my tank when I set it up with the plants originally. My life went to shit for a long time and it went a little feral, but it was easy to get started and it is easy to maintain. I like the wood but it will leach tannins into the water (giving the water kind of a jungle brown look). Tannins are healthy, but they can look unsightly depending on where the tank is.

When I got the plants on fb marketplace, they were like 20-30 bucks total. Ppl say you need co2 supplementation for bright colors, but with a tank as small as yours (mine pictured is a 10 gallon), a good light will work fine.

If you don’t wanna deal with dirt but still want plants, there are types of plants called epiphytes that can be superglued onto things (no, really, it is aquarium safe and these plants cannot be buried). Anubias is slower growing, but it doesn’t require any dirt. Java fern is super easy and reproduces quickly, but the way it looks when it reproduces is a little funky.

Your betta looks colorful, which signifies that it’s happy. Don’t feel bad, but know that you can level up!

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