Yeah, c'mon people, chime in
I suppose the problem could correct itself with proper diet and environment. I would give it a go for only about a week or two. If after that time they're still experiencing soft stool, than get worried.
I think that a product called panucur could be used as a preventative and can;t hurt. Some use it regularly to prevent parasites.
do you have a pet meds dot com? you can order it directly and dust every feeding for 3 days. If it were me, I would consider dooing that.