An addendum...recommend you get a soil test now and if it shows you need lime, then now is the time to get that done rather than later. Tell the folks doing the test your objectives for clear water for swiming and fishing. They can give a more accurate recommendation that way.
Do the test as soon as possible. Sometimes it can take a few weeks to get the results back and it would be good to take whatever actions before fall rains come and fill up the pond.
p.s. any plans for aeration?
