This is my 1st boa...

[Gio]

Spot on advice here. I agree. I will add that 55 gal is a lot for a baby. Clutter it up well and give him plenty of privacy. Boas ARE generally more active and more outgoing than BPs, but any baby can feel insecure. Give him plenty of time to adjust and leave him alone for awhile. You'll soon see a change in his mannerism once he feels safe and secure.

Edit: Just saw you other post and this is a 6 year old boa?? If so, pictures of his set up would help a LOT. I still say give him time to settle in. But at 6 years old, he could be just laid back enough that he's not as active. Usually the babies are all over the place, but the adults, not so much.

Just saw Kali's post,

and the mystery is solved as far as age.

Large boas do mellow out as she satetd, and unless you have larger sized perches they will not climb as frequently. Similar to you sitting on a 2 x 4. You can do it, but it's not a comfy as something wider.

I have no idea what the setup looks like, but a little settle time will help.

Consider some plastic caging.

I promise they move around and do more stuff than the typical royal.