Come on ya'll chip in here. I don't have enough knowledge to help this gal out but know there is a wealth of folks that do. I found this site before I even called a dirt mover and I got a bunch of advice that has made my little pond into a great place to be. I will suggest to MN that she at this point put in/up structer (taller the better}
www.Fish finding freaks or something like that. Pick the nrains of Ted lea and Sue Cruz about proper aeration. Check the affects of filling with non-filtered well water, basically high iron and low oxygen levels. Put in lots of forage, FH, BNM and SPS and spawning structure. Do these and hope some more intelligent people than I respond.