Pond Boss Forums Thread Like Summary - Adding to my pond's ecosystem...

I have a pond I dug about 10 years ago. Most of what fish are in the pond are fish I added, but not all.

Fish I added:
Ghost shrimp
Mosquito fish.
Bluegill perch
Channel Catfish
Crappie (the crappie did not survive)

Fish Added by Nature & Birds:
Large mouth Bass
Bowfin (I have not caught a bowfin in a while, but I am sure they are still there and I do not want them.)
Crawfish
Red Ear Slider Turtles

Things I plan to add:
Scuds (arthropods) I read that when you add scuds to a pond it increases the fish population all the way up the food chain.
Japanese Trapdoor Snails (they sell for over a dollar each online)
Sailfin Molly
Tilapia adding in the spring (I am breeding them in aquariums. They will reduce the plant life and give predator fish more to eat, They will not survive winter, so this is a maintenance thing.)

Things I am considering but afraid to add:
Clams (but I heard they can filter too many nutrients out of the water hurting population all the way up the food chain)
Salamander (but not sure where to get any. I have never seen any in the wild. Are there drawback to having them in a pond?)

Question: What other species would be cool to add? I am located in SE Texas
I consider my pond to be a big aquarium.
Here is a picture of my pond with 3 of my grand-monsters catching minnows.
I just started to build our home on the north side of the pond and I am so excited.

Attached Images

Southern Newts are common in weed matters similar to where grass shrimp reside. Newts in general seem more resistant to predators than other salamanders, likely because they are poisonous. Pickerel are an option that I like, because they are some of the best eating warm-water pond fish, but you need to know how to filet out the y-bones. Snow White meat and better than panfish in many cases...