I use a kelp extract and have seen good results on getting better root growth as well as helping stressed orchids.

I just looked at the old double phal. One half has lots of nice roots. The second one that is coming out of the stem has two short air roots - not enough to sustain it if I tried separating them. They are sharing one root system. I think keikis that come from the flower spike are a little different than the ones that come out of the stem.

I suspect the one with the four small basal keikis will be like that for several years.