Looks great! I know Petco sometimes sells these awesome Halfmoon Koi betta, so you can look into that. Or maybe a wild-type Betta Imbellis? That would look nice too, especially a spadetail. The butterfly betta look nice, too, along with black betta. If you want a lot of movement, the plakat work well.
Anyways, for my tank, I’m trying to keep the cost under 100 bucks, as I have other fishtanks I want to set up, (currently looking into stocking a 55 gallon), so if the 3 is alright, I’ll just use that: he’s not very active anyways. Most of his motivation to move comes from food and jumping to bite my finger. I was also considering making this a “red” tank, using all red plants, since he’s a blue/black betta. Would look gorgeous…only problem might be Co2. I do think red carpet plants exist, so that would work. Still wary of floating plants, though. He does have a betta log, so if it’s just a cover thing, I’ll put that in. I may end up with cherry shrimp in there, as he’s not very aggressive. Then again…not sure how it would work. Might toss a ghost shrimp in there first to test it.
Edit: just found this.
Alternanthera Reineckii 'Mini' aka ARM has vibrant pink, red leaves. The plant has a compact form of growth and they are often seen in Dutch-style planted aquarium designs. The high light intensity and the addition of CO2 improve the plant's growth and overall appearance. Sold as a Tissue...
aquariumplantsfactory.com
It doesn’t need Co2. My current thinking is that I trim it and keep it short as a carpet plant. Good idea or not?
I also found a red moss. Have a really good idea now. Only problem is that it doesn’t come in tissue culture.