It, s a 20 gallon. Been having some water issues setting up that I've never had before. (I have only used public water before this)Using well water that is extremely hard, and the ph was up in the stratosphere after I put the water in the tank. Did a mix of 50-50 tap water and reverse osmosis water and ph went down to 7.0-7.2. Now I put in a little fish food to get some bacteria growing, and now the tank is cloudy, so I have to figure that out.