Phoenix Sundown -- Insane Jail Interview ... Targeted Multiple Girls on 'Dance Moms'

Phoenix Sundown -- the man currently behind bars for sending sexual material to a 12-year-old star on "Dance Moms" -- is so obsessed with the show he has a tattoo of Abby Lee Miller on his throat.

Sundown was interviewed in his jail cell by KGTV in San Diego, and he revealed JoJo was not his only target ... he says he also set his sights on 12-year-old Maddie Ziegler, sending her 11 boxes of material.

It will be interesting to see what happens to this guy ... whether he's prosecuted or put in a psych ward ... or both.