AW Ranch welcome to the forum, its a wealth of great information.
I am no expert, but water testing and shocking are great ways to start.
As far as shocking Bob Lusk who runs this site is one of the best and opperates out of Whitesboro, TX (if that is close to your lake). You might want to look into his book offered on this site called Raising Trophy Bass. I have it and re-read it often.
A 20 acre lake has great potential for trophy bass, I would get it shocked for sure. That way you know what is in the lake, and which way to take it. You could find that the lake is fine the way it is. Also it could prevent you from buying fish you dont need, or buying fish that become a quick snack.
If trophy bass is your goal, I would want to find out if there are any Florida genetics in the pond (probably not). Then I would consider adding some Florida or F1 bass based on the results/advice of the shock survey team.
You can also consider things like a feeding program and fertilizer program, but I will leave that up to the pro's.
Others will be able to read a little further into your catch rates and the size of fish caught.
Please keep us updated! Good luck!
