In my old pond, I started with CC, BG, SES, and LMB, all added as the pond filled. A year later I added 25 more CC. I never did any managing after that, and the pond stayed well balanced and as good as I could have hoped for. The pond at my new place is a Duke's mixture, and I'm planning to add more to the mix this week, inclluding GSF. I found someone who sells them. Mostly curious to see what happens.