JustinK

Hi, got a question regarding my nitrate level in the tank that has been cycling for 4 weeks. This is my first 2ft x 1ft x 1.5ft tank. The nitrate level is still very high for my tank at 70-80ppm, how do i bring down the nitrate level? Do i still leave the tank as it is or do i change about 20% of the water? Can somebody advise? Thanks! Water parameters: Ammonia: 0 Nitrite: 0.01ppm Nitrate: 70-80ppm kH: 10dKh ph: 8.2 Salinity: 1.023 Temperature: 26 deg C