50 combined HSB & CC (once the latter get to a couple of pounds) should be good at keeping 200 HBG's offspring suppressed. IIRC Meadowlark is running a 4:1 HSB:HBG (TGG) ratio in his 1/4 acre pond and seeing very few offspring.
"Live like you'll die tomorrow, but manage your grass like you'll live forever." -S. M. Stirling