I ran my loader bucket into the muck to see how deep it was, and it appears to be around 6 to 8 inches. Sounds good, especially in this red clay we have. If I'm wrong, please let me know. Working under the asumption that the muck will help keep the water clear (mud-free), I'm really debating the value of losing it compared to making the tank deeper. Anyone care to offer their thoughts on this?