Hello,
I would spend the little bit of money to know exactly what I have and what I need. TAMU will save you money by making liming and fertilizing recommendations, so you may not have to do liming, at all, or spend extra money on overdoing the fertilizer. Seeing is to know; not seeing is guessing.

You still have access to the pond bottom, so now is a good time to gets the test.
http://soiltesting.tamu.edu/

Make yourself a Sechhi Disk to monitor your water clarity and plankton bloom.
http://www.noble.org/Ag/Wildlife/SecchiDisk/Index.htm

Hope This Helps...


--Kevin Mc
It's not about the stomach. It's about the fish. Take care of the fish and the stomach will be fine.