if you change 100% of your water you will only further harm you fish corals, there are products which nuetralize nitrate immediately. then do a 30% water change twice whithinside the month you need to find the source of the nitrate, dead fish? when was last time you did a water change? regular water changes under normal conditions should not let nitrate build up, 20% per fortnight med to low feeding nitrate will not build up. what filtration method are you using? live rock, trickle filter , cannister filterSpiritofthesoul;5129647; said:Do a 100% water change, closely monitor how much nitrate raise everyday by testing.
If it is still raises up fast, there is a problem.
Could be
- Overstocked
- Overfeeding
- Tons of gunk in the substrate
- Something died
- Filter have become nitrate factories
More info could help. Like tank size, tank inhabitants, nitrate reading from tap, substrate used...
With your limited statement, its hard to determine the problem.