lowrider 2 problems

Hi all . Quick question got 3 lowriders about 2 old . About 2 and a bit inch tall the big two leaves have started going yellowish in the middle of the leave but in total about 8/10 small leaves all green. But all the plants r dropping . And can't remmeber if that mean over or under watering . Got.400 watt hps about foot an half above them temp is 82/88 ph is perfect .. going to put them in. Bigger pots when they look a bit better . But when is the best time to transplant and do i think quarter strength nuties is to early to give them any help welcome
 
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