Run ro water 250ppms trio grow 150ppms of calmag to total 400 ppms ph to,5.8, with 10 to 15 % run off
Don't worrie about your ph run off .
Do this every other day until they get bigger then everyday ,I switch off and on everyday ,then every other day ,so your roots can breath .
I start my clones and seeds in Fox farm soil,then just water,till the get root bound then transplant that plug into Cocos,works every time with no deficiencies.then start a light feeding with 15to 20 % runoff .
Start using silica of some sort,silica blast,Rhino skin, in your feedings the bugs don't like to eat the plants that have silica running in the roots or the plant itself,they go away quick