I'd stick with the T8. It's a nice size for adult BPs and bloods. It's rather large for you hatchling BPs, I'd divide them for now and keep two to a cage. A lot of folks prefer the T10 because they say the added height makes it easier to clean. I have quite a few T3 & T8 and find them very easy to maintain. The balls and bloods don't require the added height the T10 offers.