plant problem, please help

my plants are 2 weeks old and i feed with canna nutrients 2ml aqua A + 2ml aqua B + 2ml rhizotonic + 2.5ml cannazym + 2ml mono CAL + 2 ml mono MAG ( it says 1-2 ml per liter of water )
i have phed my water after adding the nutes
on one of the plants it looks like it has some rust ...it looks like calcium deficiency , which is wierd since i give 2 ml of CAL

fed them too soon imo.

until now they didnt have any problem , its only 3 days they show problems , but yea they are only 2 weeks old

any idea what the ppm was for that feeding? when feeding seedlings start with 1/4 dose feedings and slowly bump it up if the plants take it fine.