1) There ain't no such thing as a "booster". Plants will bloom to there maximum genetic ability when they are grown properly, i.e, with adequate light, water, nutrition, and other appropriate cultural parameters.
2) Excessive nitrogen can dissuade blooming or stop it altogether. The marketing hype of a "Bloom Booster" fertilizer disguises the fact that the manufacturer has added an excess of a phosphorus compound to the concentrate in order to dilute the nitrogen.
3) 7-8-6 is a great fertilizer to use routinely, but I would recommend that it be used at 1.5 teaspoons per gallon at every watering in s/h culture, or 1.5-2 tsp/gal 3 out of 4 waterings in "normal" culture.
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