I undertook the project of creating a custom-designed system to mimic the estuary. I received special permission from local park rangers and rebuilt an aquarium with thickened glass on the bottom. Following completion of this, I embarked upon a journey into the estuary and returned with about 300 pounds of mud for the tank. I followed up with about two dozen mangrove propagules and voila! my estuary was born... I even have a method for manually shifting tides.