Corn Snake size and feeding help

[Outfoxed]

Thank you all so much for your answers. This Sunday I will try feeding them a Fuzzy and see what happens from there. I did measure them the best that I could with them moving around I also have some photos of the enclosure I keep them in. I do keep the temperature between 60-75F. Humidity I try to keep at at 20-30 level, sometimes I am gone for long periods of the day so I am unable to keep up with sparring the enclosure.

Nezumi- Is the youngest she will be a year April 5th, she's about 18 inches.

Kaidda- Will be a year March 26th, she's about 15 inches.

I'll post photos when I'm able to. Thank you again for all the help.