Kandy Kush By Nirvana +Flowering Tabs

So to re cap if you didn't read my opening post, I am experimenting with these complete all in 1 nutrient flowering tabs I purchased on the seed bank web site I use (nirvana.com). Says Im suppose to just place these small nutrient tabs a few inches below the soil when I switch to flower, and all I theoretically have to do is just water till harvest. We'll see..... In the beginning I was going to use these flowering Tabs on all 5 of my girls, now I think I'm just going to use the Tabs on only 2 of my plants. Just incase these Tabs don't work out as advertised. And I have my doubts. I'm just going to use the tried and true FF trio nute on the other 3. Anyways I went ahead and transplanted this week and Fim'd. Growth has been pretty explosive up until now they have slowed a bit but as expected with the stress I just induced on them. But so far I have done nothing special outside of using regular FFOF soil, PH'd tap water mixed with mycorrhizal powder every other watering. I did however noticed on 3 of my plants very small rust color spots on the the mid level fan leaves. Some are just on the edges of the leaves in 1 small spot, but on another the spot is in the middle of the leaves. I'm hoping it's just slight nute burn as ffof soil has been known to be harsh on young plants but I'd thought I see problems long before now when the plants were very young. Oh well we'll see if the problem persists and gets worse.