Potato Flake Sourdough Starter

Potato Flake Sourdough Starter

I just received a sourdough starter (that originally started in 1989) and it calls for potato flakes at every feed.  I was wondering if I can eliminate the potatoes…maybe gradually.  It’s just not an ingredient I normally keep on hand and I like the idea of having simple, non processed ingredients only in my breads.  Any advice would be appreciated!  Happy I found this forum.  TIA!