I feed all 19 of my boas in their cages and don't have any problems with cage aggression. As far as mood swings haven't really encountered that but I do have a couple that are complete :cens0r::cens0r::cens0r::cens0r::cens0r::cens0r:s (strike, hiss no matter what) and have been that way since I can remember, what kind of boa is yours? Most boas (especially females) have a crazy feeding response that many people confuse as aggression or "moodyness" lol, many of my females get "moody" around feeding time but are fine once their tummies are full lmao. I also highly recommend hook training, reaching into a cage with a 6'+ 15+ pound boa and startling her isn't my idea of a fun time!