I grow all of ours in CHC, charcoal, fine bark, and sponge rok, and the mix is heavy on the CHC for the moisture retention. I used to put the pots in little trays of water--they would grow like crazy for two-three months immediately after and then slowly go downhill, so I quit doing that. Now I just make sure the medium stays consistenly damp, and I've got an extra oscillating fan blowing on them all the time. I've never used Aussie Gold, but I imagine it would work just fine. The only reason I put together our own mixes here is that I can't be watering every day or trying to keep track of who needs water more often, who needs it less, etc. I just adjust the mix for a particular type of plant so that I can water everything at the same time once or twice a week and know that the ones that need to stay wetter will do that.

There are only a few phrag species that like their roots constantly sopping wet, (besseae, for instance, loves water) but none of the hybrids I know of do--at least, they don't for me. So all the Phrags here are kept consistently *damp* but never allowed to dry out between waterings, and that's worked out really well for us.

Penns Creek Cascade is (caudatum (or warscewizianum) x longifolium) x wallisii, none of which (to my knowledge) enjoy standing, stagnant water, so make sure you're not keeping yours sopping wet. Here is a thread where some Phrag water issues are discussed; you can find more if you do a search here using the keywords "phrags" and "water." Hope this helps some!