i got my 3 on 420 and there were as small as urs and they are now 15 times bigger, there on 18/6 ass well not 24 hours. Hydro drip system wiith a timer for a 15 min drip 3 times a day is the set up, im using aqua vega a and aqua vega b for veg with once a week rhizotonic feeding for strong roots. 400 hps light .