I like fishing for CC, but they won't do anything to seal a pond basin and turtles would clean anything that died.
If you want to grow lunker bass, I would only stock about 20 LMB. If you're happy with mostly 1-3 pounders, go with around 75. You'll need to stock 4-6" LMB or larger.
I would also put in 15-25 pounds of Golden Shiners in the hopes that they will establish themselves. Right now you have a lot of really hungry gills eating their young with no minnows to munch on. Although it's a little late, I would add 50 pounds of Fathead Minnows also. The FH will help the GSH get established and will feed your BG and LMB the first year but will all get eaten.
Others will be along soon to offer more options and in-depth reasoning I'm sure.
