I think for starters that as long as you are dosing some Iron and trace that the plants will do ok, but it you want then to really color up and thrive then you may want to fine tune your dosage of trace after getting everything else in order. I use Flourish so I can't speak of this product you are using, but what I can say is that your best indicator of Iron and trace dosages have to be your plants. The test kits can be misleading. I think all that they are really good for is telling you that Iron is present, but beyond that don't do too much. Just start conservatively and slowly say every 3-4 weeks increase dosages. Note your observations and stop increasing the dosage of trace when you start to get too much spot algae or don't see an improvemnt anymore and do weekly water changes to keep any one element from building up to toxic levels.