Second time this has happend this grow season - Why?

[solareclipse]

hi guys i make a few grows this year this fotos u will see is the last one maybe i will reply and show u the fotos from the first grow of this grow season...lets see and hopefually someone will have an answer...
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those 2 are shark bite strain ...same age..same seedbank same soil similar situations of grow and look how is the one and the other....the big one i could see fom begin its gonna be a smaal yield but better than others...the other one was 3 set of everything...leaves stems branches and no more than 3 inches all or any good bud on...i will try to find some picts how was younger...those are fifth week minimum...

fotos younger or how is the correct word...

lets see the purple kush nearly on 7th week...i will start from the younger fotos to the present...

now lets see the sweet mango ..again the older fotos first....

sorry i delete accidentally the fotos the today fotos...it is 2 inches taller with a small bud on top..lets search


the narco purps and,,,
again...

one more foto from the smalll shark bit with the 3 set of leaves...
..what is the problem here?anyone can inlight me what i did wrong and destroy so many plants?
why all my plants not to be like this one?it is not so big but it is not like those...i talk about the damnesia from strain hunters...

and last here is some fotos from my first grow i had similar problems..what the hell is going on here guys?some help please??

thank u for watching this.i hope someone can tell me what to do to get some height or some more veg phase..or ???????

 

[solareclipse]

also i would like to ask one more question...is citric acid ok to low the ph of the feeding water?or shall i use somthing else?thank u guys