I grow in soil in 11l finals, no fert till week 1 flower its not 20 days in, and im feeding 2ml grow 1 ml bloom 1 ml topmax two of my four plants have leads curling slightly under. Its the tip of the leave curling under.
I only water 2-3 litres every two days anyone got any ideas ?

A pic would help mate, but it sounds like it could either be a fert or a watering problem.

How do you determine when to water them and how much are you giving them?

What's the compost you are using too?

I'm in the same pots, in plagron lightmix 18 days into flower and using BB nutes. I follow OT1's biobizz feed schedule and it's working great for me. I'm up to the recommended 1ml grow 2ml bloom (no topmax, apparently it's a waste of money ) and I was on the lookout for them needing a one-off epsom dose about day 21 (1 heaped tablespoon/10litres) but these Satori are needy for Mg anyway so they had there epsoms last watering 9because they asked for it .

As eri says how are you watering? I wouldn't recommend by a schedule, only water when the plants are dry and need it

Could it be that you're feeding them too much for the compost they are in? or maybe overwatering?