I'm using bat Guano for ferts and I'm wondering if the plants need any extra nutes while flowering - e.g. Do they use up particular elements quickly N, P, K or Mg for example during flowering?

I should be able to source natural organic products for most situations - but annoyingly the highbred.net forum is down which was all about the lowryder so any advice would be welcome.

Maybe I'm just paranoid...