Hey reefers, cycled a new 29 gallon aquarium for my son but made a rookie mistake of not doing a large enough water change to lower nitrates. They are in the 20-40ppm ATI test. I have mixed up some new salt water, matched the temps and ph levels. Do you think it would ok to change say 50 percent of the tanks water volume? I have 2 black storms, green chromis, 4 hermits, 2 Mexican Turbos. Look like to get nitrates under 10ppm to discourage nusciance algae from forming.