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I live in Oklahoma city and my wife and I are about to start growing for ourselves and we are going the aquaponic route. We are wanting to go soilless and only use clay pebbles, so aside from the nutrients supplied by the fish what else will we need to add and since it will be soilless. What is the best way to add it? Another question if we are doing a bell siphon do we have the water constantly running or have it on a timer?