Any harm?

aside from the possible hermi is there any harm in running 12/12 for 3 days n then back to 18/6 i wanted to promote a little more verticle out of my indicas thy are 60 days old today n showing ZERO signs of sex n went into 12/12 2 days ago almost all branches have shot up 2inchs n the free seed "sativa" shot up 3inch on main stem alone... added epsom salt, n a potash supliment where showing signs of deficency n also since i have ZERO cal-mag or mag supliments in this country.. not worth pictures just a general question becouse i wanted to go back into veg for 1 more week well 2 due to stress from this

No harm.

Many people flower for 5-7 days early on to determine sex, then throw them back into veg. Don't think you'll get a lot of stretch in such a short period, but it won't hurt.

-spek

thanks man n no thy have streached n alot after today marks 3 days of 12/12 n so far the indicas have streached 1.4incs from where thy were still cant belive that... also there was nute deficeny before i ferted with a hot mix but 7.0 1100ppm i should of mentioned that but still im already rolling back the nutes tho as we speek just a hot mix for a 4 day feed every 2 day period n then back to normal