The Scarlet Betta

Kia ora koutou, I feel bad, but I have to conclude that I'm just not going to be giving my fish the life it deserves. I'm not in a hurry though. It's 2-3" long including tail, healthy, black with some white near gills and red coming through the black around there. Lightening up over time. Currently in a pretty mediocre ~90 L tank you're welcome to, and I have a 200 L tank you could choose if you'd prefer. I'd water test them it though, no known leaks but has been sitting in a garage for years. I'll try and take a decent picture tonight. Cheers all