New Grower showing sex... how long to wait.

Himalayan blue diesel
Hi all... its going well i suppose, nice to have read that Muddy gives the HBD a thumbs up. At day 25 my girls are growing at least an inch or more per day. I have been tucking the fan leaves under to give the lower branches some light. the girls are under 4 40 watt cfl bulbs. I can see what this is about now i guess. tops = buds? any way my question is... i am using bat guano for my only nutes. i may have been a bit heavy at first but the yellow tips seem to be sorted out by the plant after a few good waterings. I am going to switch to the 2/17/0at the next feeding... i am wondering if i should get some pottasium in there just in case or just let it ride for now? These girls go pretty quickly so maybe not an issue. What are the signs of pottasium defficiency?
thanks again.
 
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