as has been said it is important to not stress your snake by sticking it in an enclosure that is too big , for the rather cheap price of tubs it is well worth just getting a range from a small tub to larger ones as your blood will grow out of them quite quickly.
Give him two hides so they can move and get comfortable for the temps it wants, and make the hides snug fitting as well, make sure it has water, for babies dont place near areas that has loads of traffic, keep them settled in a quiet area and let them settle in.
Dont handle too often initially and I suggest leaving it for a week to properly settle in. Bloods are great feeders if you get the set up right if you dont then things can get problematic if they are stressed, and they can quickly take a downward spiral if conditions are not met.
If the sides are pretty clear on the tub you can use newspaper and let it sit halfway up the sides to again make it more secure for him.
BTW thats a beautiful little Blood congrats. :)