Nutrients - Too early for quarter/third strength?

Your diary says your soil mfg says 3-4 weeks before needing additional feeding. Please adhere to that. If you start feeding your seedlings, you may overfeed, even at 25-30% For example, I use FoxFarm Ocean Forrest, and I normally don't feed for 30-45 days. If your plants are looking good, don't force feed, "just because". If the breeder says, the strain likes nutes or not, will determine whether you start at 50%, or something less, after the 30-45 day period. If you get nute burn or lockout in veg, you can most likely grow out of it, but if you do this in flower, you will have to live with knarly looking leaves until harvest. Good luck, and good common sense down the road.👍