first grow dutch passion OB

i started my first grow about 20 days ago using 250w evio blue spectrum, and also got 1 250w and 1 125w red spectrum for flowering in a cupboard 20"x34" 64" tall with 20/4 light cycle

all seems well so far seems she looks very healthy but i have noticed a few white spots on the very tips of 2 leaves and one of the leaves has a white edge.. might just be me being over paranoid but its my first grow and im sure its not normal, could i be over-feeding it?
i have been using vitalink plant start about 1/3 - 1/2 strength from about week after it sprouted on every feed

it also seems to be smal for its age, its about 4-5" tall at day 20 is that normal for duch passion OB?

and comments or tips on growin this strain would be much appreciated
thanks

The tips could be over watering or ph is off. Your soil looks pretty wet.
Also I've had much better results with 20/4. Every time i've done this (24/0) the plants actually grew slower.
Like everything else I believe plants need time to rest. If you let them they will reward you.
That being said to each his own. Happy HALLOWEEN!!!

well i'v just re-potted her this morning so i had to give her a good feed and water, might be why the soil looks so wet

but as for the ph i didnt bother getting a ph tester or the adjusters as a friend of mine told me its not important till 2-3 weeks before harvest
(this is my first grow so im still kinda unprepared and inexperienced)
overall i think it looks healthy though
just a bit concerned about them spots also one of the edges of a leaf is white though u cant really see it on the pic

could i have done damage from not having ideal ph lvl's?

thanks for the reply and happy halloween to u too

ph is important all the way thru but it seems healthy for now anyway

you got a long ways to go, hang in there

if you have just repotted then you shouldnt need to feed, most compost has enough nutes for 4 weeks or so. put a red light in there with the blue, they like a mix.