Phal root rot, what should I do now?

[playtime8978]

I bought two NOID Phals from Lidl about 3 or 4 weeks a white one and a yellow one with pink spotting. The white one has been great not a problem so far. Sadly the yellow one is the thorn in my side, so far it has had bud blast, mild case of scale and now bad root rot. I have treated them the same but I repotteed the yellow one as I didnt like the look of the roots a couple of weeks ago but when I pressed them they were firm well not now the leaves were floppy yesterday and I automatically thought 'oh god root rot' so today I took it out of its pot and omg what a mess all but one under medium root was squishy and hollow and they had little white spots on so off they came, I had a fungicide so after I had removed all the dead matter I dipped the roots left which was one under medium root and two aerial roots into fungicide in water and gently eased the aerial roots into the pot and repotted in fresh bark I fear that the aerial roots will not survive as they are not used to being in the medium if this is the case there is only one root which is viable, it has two spikes on one which the buds are just starting to open. I am guessing I need to remove the spikes so the plant can concentrate its energy on new root growth but I am reluctant to do this unless I am told yes it is neccesary. as the buds are just starting to open on one of the spikes. Have I done the right thing and if not any advice please and what should I do about these spikes, I read somewhere that feeding with seaweed fertiliser stimulates root growth, does anyone know if this is correct or not ? just about at the point of giving up but battle on the other is healthy so I've done something right with that one so far. My Thunia alba is growing well and my Maxillaria and Dendrobium haven't keeled over and died yet so I am hoping I can get over this set back and carry on. I also think when I got it and repotted I should have taken the suspect roots off then but I was hoping they would be ok. so what now? is thre any chance this guy will survive or have I killed my second Phal