phalanopsis with root rot and black spot

[Lulu627]

i noticed my phalaenopsis orchid had a black spot i think its crown rot not sure i have it in a glass vase leting it dry off it was in moss, i cut off all the bad roots and was left with just a couple good roots i rubbed some alcohol and now just letting it rest my question is i cut a root off that had some black at the tip will that root continue growing? Is there anything else i should do about the black spot any advise is greatly appreciated