Rechecked the site I read arowana grew to 28" in captivity and it was 38" :duh:
Doing a bit more research on the teacup I found that even though they are the smallest of the freshwater rays, the tails are extremely long, which makes them need wider space then I once thought
Now I am looking into finding a 300g instead of the 240g.
240g = 8'x2'x2'
300g = 8'x30"x2'
The site with the teacup info says that 30" width will be fine for full grown males
I really want to include the ray, the arowana I can deal with not having, lol