At this point, I don't think you desperately need to start the pond over based on your stated goals. You can always kill or renovate the pond later if the fishery degrades to unacceptable conditions. snrub has provided some common sense advice - do some selective fish removal which can deal with overstocked. Keep in mind you will need lots of small bass to control offspring of the crappie when they are large enough to spawn.
Add several large 8" BG from any good water quality source which can't cause a lot more negative impact. Look through the sunfish archive for differences between the species including hybridBG. Know the basic differences. Note the pure BG (males and females) have a completely dark gill flap to the margin with absolutely no colored or clear thin rear margin possessed by most other sunfish and their hybrids.
http://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=92482#Post92482Although you possibly received some hybrids or GSF fingerlings with your order of 'red & blue bluegill' from Zetts. At 1"-2" long the sunfish species are very difficult to distinguish from a mixed or contaminated species pond at the fish farm.
Your introduced plants are probably okay, but keep an eye open & remove any unplanted things growing among or near those that were planted. From experience, Zetts sells some acceptable water lilies. His yellow iris spread fast so watch for that potential.
One correction, Daphnia (aka water fleas) do not cause swimmers itch. Swimmers itch is an itching rash caused by a free-swimming parasite (cercaria) of flukes that try to burrow into the skin of people in the water. The cercaria are looking for waterfowl and swimmers are a substitute. Snails are the parasite host and a part of the life cycle of the flukes. Any introduced snails can be contaminated with a life stage of the flukes. Waterfowl transport the flukes.
The Daphnia are a beneficial water filtering zooplankton Crustacean. The fingerling fish, minnows, and shiners will pretty much eliminate the Dephnia depending on the species(adult size) that Zetts provided. Some adult Daphnia are large and vulnerable whereas some are a lot smaller and can survive some fish predation in certain conditions. IMO the Zetts Daphnia cultures are very likely not pure Daphnia cultures and include numerous species of mixed zooplankton; not really a bad thing.
