Two tubs about 15 gallons each. Filled to about 20ish total gallons. Grow bed is an Earth Box that a friend gave me. I plugged the hole in earth box and made a new one in the bottom for a siphon. Using hydroton and a scouring pad to catch solids. Also using a bbq thermometer to keep an eye on water temps and make sure they don't get to high during the day.