Hi,
First thing you want to do is get em in rubbermaids, housed individuly (you didnt mention if they were together or not but if so, seperate them!!). Just use newspaper, a water bowl and of cource a hide. They seem to do much better in these conditions and I personaly thinks it makes them feell much more secure(they are very open in a 10 gallon glass tank, if thats what your useing). Secondly, place their temps at about 83-86 with a drop to the high 70s at night. Thirdly, try very small fuzzies or peach fuzzies. The hair seems to help in getting little cobras to want to eat. My guess is there is more sent then that on the naked skin of a pink. Lastly, if some are eating pinks well yet still look thin try uping their feed schedual to once every 3 days untill they have satisfactory weight on them.
Oh yeah, if some wont take mice voluntarily, try senting with frog. Frog sent is usualy a very good sent to try and trick the little buggers into feeding with and I have had great sucsess with this method numerous times. If they dont take even sented food your going to have to assist or force feed them. Being a hot herper, I trust and hope you know how top do so. If not, find somone who does!! You can really hurt them if you do it wrong!
Welp, best of luck with them and let me know if you need more assistance. If you dont know a herper in your area to help (if you dont know how to force feed) let me know were you are and Ill see what I can do about locateing someone for ya.
Later,
Jeremy