If you follow the usual caveats on feeding (feed floating food for easy monitoring, don't feed more than 10 lbs/acre or more than the fish eat in 10-15 minutes - those types of thumb-rules), I don't think you can hurt anything. At one feeding per week, it may take a while before the fish figure it all out (feed once a day during a vacation at the farm to get started?). My CC have a pretty good memory and recall right away what the food is for when I start feeding in the Spring (water temp > 60 deg), so I think that once a week would do them some good after they got started. I can't speak for BG eating feed, as mine haven't ever caught on yet.