[RooRman]

There are many dry ferts. you could add directly to the soil mix. Bone and Blood meal will work, but they take a long time to break down and provide any nutrients that would benefit the plant. I prefer kelp meal and fish meal instead for dry fertilizer. You do not want to add too many ferts. to the soil-mix from the start, this is bad for seedlings and makes it hard to judge the nutrient content of the soil at any given point during the grow. I let the liquid nutrients do most of the work feeding the plant as these can be applied at the appropriate time.

I have not used Fox Farms Big Grow/Bloom but I have used FF Tiger Bloom. If you are using Tiger Bloom with other flowering ferts. I recommend you don’t exceed 50% strength (2 tsp. per gallon). The Tiger Bloom will burn the plants if they are overfed, it is very strong stuff. It is much better to underfeed then it is to overfeed and need to correct problems on otherwise healthy plants.

If you want to use bat guano read this...
Bat Guano for Organic Indoor Gardening w/RooRman

Tiger Bloom and Bat Guano is a good combo.