Welcome to RUI
Your questions on nutrients are tough to answer because there are so many out there and it really comes down to personal opinion. But i would suggest holding off on nutes until the plants are 3 weeks old. Also, i noticed this is a soil grow so go grab a bag of Fox Farm Oceans Forest soil before your next transplant. Best stuff out there and it will feed your plants for the three weeks until there ready for the stronger nutes.
I personally use Fox Farm Nutes and the work fine. The best way to tell what you like is to try them and decide which work best for you.
Good Luck, hope this helps
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