Vanda root problems

[SoFlaOrchids]

Hello

New to the forums

I'm in Miami (Zone 10) and it's very hot and humid here

I love Vandas and I have recently started to grow my small collection.
I currently have 5 including a seedling.

- Gordon Dillon X Pakchong Blue
-Aranda Jairak Heartthrob "Red Spot"
- Somsri Pink x Kulwadee Fragrance
-Pakchong Blue
-(Siam Ruby x Ascda Leenakamolphan) X Ascda. Leenakamolphan x Betty May (SEEDLING)

Problem: My Gordon Dillon x Pakchong Blue's roots are not looking very good. I had it together with my Aranda Jairak Heartthrob Red Spot in a water culture and the both seemed to like until the Gordon Dillon roots started to rot.

I removed both from water and put them in a wooden basket with some wet moss. My yard is facing West and I'm not sure that will be a problem for all of them since I keep reading that Vandas should be facing East.

I just recently started using a Fertilizer (19-4-23) from rePotme and a Probiotics as well.

How often should I use both Fertilizer and Quantum-Orchid Probiotic on them?

I have added pictures of both Gordon Dillon and Aranda Jairak to see what you guys can recommend.

Thank you guys