m0useanswered grow question 2 years ago I see your medium is comprized of fox farm ocean forrest, vermiculite, perlite, compost and peat moss according to your week 3 entry.
I would stick to the dry amendments for this grow if it was me and they can be mixed into the topsoil and then watered in with PH adjusted water. its simple and easy. as Ezzjaybruh said down to earth, dr earth or Gaia Green are good companies that make whole ingredient dry amendments that need microbes to break em down. GIven they are photoperiod they can take the extra feed that is present in fox farms ocean forest soil. some autos have issues with that.
If you want to use liquid/crystal nutrients I would highly suggest investing in a EC pen to calculate the concentration of the feeding solution. It can also be used as a diagnostic tool to help find/solve issues should they arise.
And just like Ezzjaybrush said, if you have just switched to flower give them food now as they are preparing to stretch and want a good helping of nutrients.
One other option is top dressing with just FFOF soil mixed with worm castings as a small feed till you get some other fertilizers in the medium.
Let us know what you plan on feeding them with and we can give you some better feedback and direction.
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Best Of Luck!