I'm not sure about Floracious Grow and Bloom. However, if it is anything like th GH then you do mix the grow and bloom. The grow should be at a higher strength then the bloom but you use both. For instance, with the GH, for Veg you use 3 parts Grow and 1 part bloom per gallon. But even in the veg stage you need P-K. Difference is for the GH there is a micro formula too that adds a lot of the secondary nutes. Then of course if you are using distilled water you will want to add Cal-Mag.

As for the brown dirt, I started to see something like a brown film on the sides and bottom of my res when I added in Liquid Karma and Hygrozmye. I think it's resdue for the organic - not sure. Sorry, can't be of much help here.