Yep, Ag services or take a sample and send it away. Great Lakes in Ft. Wayne, Indiana, Texas A&M University, etc. all do the testing that you are looking for. There's other universities that do the testing too. I haven't looked into Purdue but they are heavily into agriculture among other subjects.

Nitrogen, Phosporous, Alkalinity, Hardness, pH, etc.

Grass Carp will eat FA, but it's a ways down their preferred food list. For a FA only problem, I wouldn't stock them.

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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).