Im not terribly familiar with outdoor aqua culture.
The only outstanding problem I see is the depth of your water. I would think 8 to 12 inches to be much to shallow primarily with lighting from the (sun?) most likely you would not get enough water buffer to filter the light.
I would guess a depth of around 24" to be more suitable. Another good suggestion would be to do online research regarding your particular situation.
Im sure I haven't been much help regarding your problem but if I can answer any other questions regarding my book I'd be happy to do what I can. Robert