I am building a bog filter for my small pond with a 70 gallon stock tank. Water pumped into the bottom and outflow with a collection pipe at the top return to the pond via a stream. The filter will be filled with pea gravel and topped with a larger gravel above the water line to reduce mosquito. I was wondering if this setup will grow lotus plants? Does the lotus require soil to grow or will the pea gravel work? Does the lotus have to have leaves float on the water to grow or can it survive with the standing leafs.