somemore info on this grow...

i had them under a 400 watt mh and the temps in the tent were about 82-86 degrees. i had them there for about 3 1/2 weeks. Then now i took out the mh and just put up 8 5500k cfls and got the temps down dramatically to 72-74 do you think that may be the problem? shocking the plants causing them to not intake the nutes as well?