Welcome to Pond Boss!

How deep is your pond? (Average depth of the bottom and maximum depth?) That will help the experts answer your questions about muck reductions and the cost/benefit thereof.

Another important data point you can give them is the "relative weight" of the fish you used to be catching in your pond. It is essentially a measure of the health of your fish. Fat and happy versus underweight and showing that some important factor in your pond is out of balance. (Maybe plug "relative weight" and Pond Boss into your favorite search engine for some basic information.)

A 1.2 acre pond in Georgia should be capable of producing a large bounty of fish every year. I suspect there are definite improvements to be made to your pond. Keep posting your observations and some of the experts can keep giving you advice.

P.S. Your new fish are almost certainly still in there, I think patience will be a virtue for you. However, esshup is absolutely correct that your new fish are probably having a tough time after being tossed into a completely unknown environment. Some may even fail to thrive. Fortunately, some should also find good niches for themselves in your pond and once again become fat and happy.