Hi Izzie,
I use peanuts in almost every pot. It's not uncommon to fill the bottom third with styro peanuts for plants that make shallow roots. I would avoid the colored ones. The pastel pink and green peanuts may be fine, but those colors are codes for intended use (like anti-static for packing electronics). That just kind of scares me a little so I stick with the plain white.
Also, I use a seedling bark mix for some of my Phals. I don't do sphag very well and I've found (in my conditions) that the fine bark can be used kind of like sphag. I wouldn't mix them together, though. They're too different and things may stay too wet.
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