Expanded clay for Phal repotting?

[ValorieBoyer]

I just had one of my phals die on me, pretty certain it was because I hadn't repotted it and the sphag moss led to root rot. SO. Time to seriously think about repotting my other babies before the same thing happens! I've been thinking about expanded clay, it's pretty, leads to good aeration and has good water retention but won't lead to root rot (that I know of). Any of you used that type of potting medium for your phals yet?