Can't get your photos to come up but from the gallery they look good. We should wait and see how they do but I'm thinking you can probably start feeding them nutrient in a couple weeks.
When you mix your nutrient add the cal/mag first into the water and make sure it's well mixed. Second will be the silicate, also making sure it's well mixed and then your base ferts. This is so you don't precipitate the solution. You'll be feeding right away so not a big chance of that happening but always good to start best practices so when you move into auto irrigation and have a nutrient solution reservoir tank you'll understand how you need to mix the solution so that you don't get deficiencies down the road.
The rule of thumb is you don't want to mix phosphate based nutrients with calcium containing nutrients. This is if you will be housing a solution for an extended period of time. If you're going to mix and feed that same day then you don't need to follow it as much but, again, good practice for when you do get to that stage.
I use 2 tanks and keep them completely separated if I have to leave for an extended period of time.