no worries elway m8
i usually give them there normal vegging food for the first week of the flowering cycle then switch to the flowering food this helps the plant ajust to the new cycle of light it finds itself under,
i feed my plants with the nutes twice a week in between waterings and this works ok for me
to determine if you should water it or not i stick my finger in the top of the soil and if it feels dry at about 2 inches deep then i water
keep an eye on this every time ya enter ya grow room and you should get along ok
hope this helps m8
cheers all