If I were to lower the level of my pond say 2 feet, can I turn the valve or should I have a specialist come in? If I turn the valve, what should I watch for, or pay close attention to so I won't make a mess or drain the whole pond. I'm considering this because I have a pond full of small bream and I've heard if you drain the pond down a couple feet in the fall the minnows less room to hide from bass and catfish.