switching to flower

I plan on switching to flower tomorrow. Everything is around 13-16 inches tall. Ive got them in 1/3 SS in 5 gallon pots. Any advice you have to help keep these things healthy? I know its supposed to be feeding free, but any recommendations for a newbie? Thanks!

yes. ill help you out first tell us what size bulbs you are using in flower. and the space available the height most important ? ill try to get you the max yield with your set up

well I was going to suggest . 2 feet tall min for a 600 watt hps grow. then your guaranteed to pull 2 ounces or more from each plant shorter plants don't produce yield. unless toped 10 times.

400w hortilux hps. The tent is 3x3x6

then 1.5 feet tall veg and 4 plants per light. pull 6 ounces average . any taller is to tall. that's how I would do it. for max yield. finish height is about 3 feet tall each . trim all those very bottom branches off. close to the soil. so I would wait another week or so to flower it will make a difference in yield .

I am also putting my 9 plants into flower, tomorrow.

They've had 48 days of VEG and average out at 22" high but bushy.
They are under 1000w HPS, in clay pebbles using a WILMA HYDRO.

CANNA AQUA VEGA A&B (not swapping to FLORES)
CANNAYM
CANNA RHIZOTONIC
Essentials pH UP, pH DOWN.

60% rain and 40% tap for EC0.4 as a base (V high EC tap water).

48 days VEG but over fed during 1st week stunted growth.