Banana Purple Punch 420fast

Plant is growing well. First 2 sets of leaves had deformities so had me worrying but another growmies from here told me totally normal for first set of leaves today I have started using biobizz bio grow feed following the feed chart of 2ml per litre of water the only thing I am struggling is how much should I water my plant currently watering 100ml - 170ml. Per 5 days But other than that she seems to be growing nice and healthy. And strong I was advised to tilt my fan towards my plants a little to help with oxygen and to help stiffen stems ! So I have done that I am wondering when I should start low stress her And is she the right size for her age