If that's what they say that's what I would do. The system looks good it's kind of combo like it says. Flush for 3 days when you see a problem, just PH the water. Are you using cal-mag plus ? do the rockwool cubes seem saoking wet ? It looks like calcium defeincies and overwatering. Do you have good ventilation in and out ? Don't panic if I steer you to wrong the big guy's will come in. We're going to get you back to good.