Why don't you post your vegetation cage question in a separate thread under the aquatic vegetation sub forum. You will probably get more responses that way...
I am surprised with as far north as you are in FL, that the tarpon in particular aren't winter killing in such a small pond. Perhaps it's the extremely mild winter we're having. I had always believed tarpon were extremely sensitive to cold water. Snook are too, that cold winter we had a couple years back killed many in south FL.
Seems like you may want to remove some of your grass carp... I'd maybe keep one or two at most. 4 is an awful lot for a 1/4 acre pond.
