Hi Gilly,
I grow in soil with amendments and I have used Monster Bloom for the past few grows. I did not really follow the schedule for the nutrient and just gave half servings now and then, probably once a week. Then, for my last grow, someone at a hydroponics store corrected me in saying that it is more of an additive than a nutrient. This past grow I used another bloom supplement (hydroponics store house brand) and monster bloom two or three times total during flowering. I have never gotten nutrient burn but at the same time because of my amendments in the soil I use nutrients sparingly. So, I would say it is safe to use both products as long as you are conscious of the volume of each you are putting in and not doubling up on nutes in one feeding.
