I think you have lots to learn and this website is a wonderful place to start. Many of the questions you asked are covered here. Also to let you know we install aeration systmes in your area. I can not tell you what you need it depends on your goals. Feel free to visits us at http://www.lakework.com and visit products page for founatin info. Call or email with any questions even if we can not help you directly we will try to help make your dcision a little easier. BTW had a crew in Columbus today spraying aquatic vegetation and I will be in Harris county working on new lake for Jeff Foxworthy on Monday. I might have time for a consult if interested while in the area. Good luck.

Greg Grimes
www.lakework.com