APCENTER
If the pond would actually die off and dry you could get rid of any GS that may have reverted back. But if it leaves puddles you may have to use retnone to kill off what would be left. GS can live in very little water for some time. On the plus side if the pond were to get low enough to kill off most fish but not GS it would be fairly cheap to treat the small amout of water left. I guess like you hinted earlier time will tell what the pond does. Hey anyways have fun with it and good luck.
