That's what I did, Bill.
When I moved here in March, 2012 the CT was so bad you couldn't row a boat in the pond. Treated with Fluridone in June 2012, followed with stocking 8, 12" GC in the fall. Follow up treatment again with Fluridone in Spring 2013 and to date my pond is clean.
The GC are huge yet rarely seen. I'd remove them if I could catch them and restock at 12" if needed.
I believe the way it's worked for me is that the GC have kept the lawn mowed
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