1ST grow, about 3 weeks into flower, please help with whats going on

my girls have been looking amazing, but lately more and more leaves are starting to look not so green, especially the fan leaves. almost all the fan leaves on my 2 huge girls are yellow with Grey/brown spots and the edges are like a brown burn color, and the very tip of there finger nails are curling up. now this is my 1st time growing, i don't know if this is because these plants are huge and this could be normal during the flower stage or what. but please if u have any opinions or may know whats going on please comment. if this is fixable i really want to help these girls heal cause they are so beautiful, thank u

p.s. I'm using soil, happy tree frog mixed with light warrior, 600 hps, incline fan and oscillating fan, 4X4X7 grow tent in walk in closet, i check ph b4 putting in soil. I'm using triflex base and bloom with bloombastic (if u want disco ball buds use bloombastic)

hmm id have to say over fertilized tell tale sign is curling of tips and the burning,if your talking about happy frog soil they recently within the last year switched the wood ships they were adding in their soil to a different locations and causing rust spots now because of this,this is the brown spots your indicating i think,as for your old yellow leaves some leaves just do that especially the oldest ones, just pick those off, its good in my opinion to pull large fan leaves to a certain extent,and plants need more nitrogen in the flowering stage so lack of nitrogen is also your cause of yellowing of the leaves,try giving your plants one or 2 next waterings with just straight ph'd water then a light feeding feed.

well i do water my girls every 3-4 days with a regual dose (no super strength) of base and bloom, with bloombastic (0-20-21), should i hold of on bloombastic the next feeding?

i was thinking to it might also have to do with a little N def, since it is getting a lot of P K with bloombastic

id flush it,then start over with smaller doses of nutes& plain water every 3rd feeding. Thats what i did to save my g.daddy purp.its leaves did same thing. I overfed it- plus m/grow soil. It lockt up,flushing helped it

yea i was thinking of doing that, but i just wasnt sure if it was from over feeding