Cecil;
As with other species combinations, a balance must be struck. I count on my largemouth bass to keep the israeli carp and koi in check. When dealing with an older pond (50+ yrs)with lots of undesirable vegetation one either lives with the unwanted vegetation (yuk!) or takes measures to control it. I am opting for the chemical free route, so I am going with the israeli's and koi. So far I'm having no problems with turbid water, etc., and if I get to that point/problem I'll deal with it at that time.
