I appreciate everyone's interest and responses to this project. The Oak tannin thing is a concern. There has been no lime treatment of soil. Perhaps I could throw a few sacrificial fish into the 3' of water and see what happens. The rock formation is simply where several gullies converge from off my property to form the beginning of the pond. The Oak and Cedar were rough cut by Woods of Mission Timber(Bob Pugh owner) in Sanger TX. A very interesting place to visit
