The claw, from hell!!possible answer!!

Ok,im hoping that my total stupididty might be the answer to our problems,ok,ive a 140 liter tank,and a 70 liter tank........so basicaly for the past 6 weeks ive been feeding the two tanks the SAME amount of nutrients,the small tank is perfect,no claw...the big tank(the bigger plants)THE CLAW!!,the smaller plants in the big tank,NO CLAW!!so bottom line is(i think)lack of nutrients in the flowering stage........this is a possability to this mystery!!!any feed back,woud love to get to the bottom of this!!!
 
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