What you should not do is mix KH2PO4 and any Fe trace mix in a bottle in order to dose them together. The concentrations in the bottle will be such that the Fe and PO4 will combine (FePO4) and precipitate out.
However, adding each separately to a tank shouldn't be a problem as they will very quickly become very diluted. Using autodosing I dose both every day but just to be on the safe side they are dosed a couple of hours apart. I probably wouldn't have any problem dosing them within minutes of each other or even at the same time at different spots in the tank... |