Likely a good idea to fill-out the CanCon troubleshooting form. The link is in my signature. Just copy-n-paste it here, and fill it out as best as you can.

If you fed them the liquid or any another additive, flush immediately with properly ph'd water, as it's way too soon to be feeding them extra. There's already enough nutrients in the potting mix to last a month and a half or longer. The bronzing could be from too many nutrients, or too much Superthrive. (are you using any Superthrive or a similar additive?)