i used the same bulb the whole grow i didnt have the stretch issue some people do have guess i was lucky and the 20-20-20 is good for veg but you want higher P in flower.

yabatab- i use calmag plus with every watering so i think that should cover the calcium plus the nutes have micro's in them too, i believe its the PH she needs water tonight so ill add some extra calmag plus to be sure and add some slightly high PH'ed water