My tank has cycled!
Yesterday I got an ammonia reading of 0, and a Nitrite reading of 0. My tank is a 55 gallon, that has about 43 gallons of actual water in it, so I changed out 16 gallons of water with new fresh saltwater. Today I check again, and again no ammonia or nitrite, but my nitrate is still 20ppm. Is this level okay, or do I need to do another water change? If so, how many gallons would you recommend? I don't want to do too much too fast and kill off my newly cycled tank.