question on king snake care

[fishingfool]

Ok so i have decided i want a kingsnake beacuse i want a snake eater but indigos are to much to spend for me so I'm debateing between a arazona moutian king or a black and white California king snake now my question is the care much diffrent and do all king snakes eat snakes i was reading a care sheet and it advised mice as a main food but i was told larger adults should eat at least weaned rat pups and a ball python from time to time so i know they need the basic water bowl an some humidity and a few hides and plants this care sheet (witch I'm ganna prob find a new one) also said a 15 gallon is perfectly fine for an adult snake where i was thinking more like a 4 long 3wide and 3tall for more space do they like to climb at all or do they tend to borrow more and if the borrow wjats a good subtrate depth to keep them from staying off the heat pad and being south western reptiles do they require a UVB or UV lamp for certain. time periods alo is there any plants that are bad for there heath when it comes to growing in the enclosure