what soil should i use for seedlings next time around?
If you like FF use Happy Frog, it's for babies and clones.
it's not near as packed with Nutes as OF.
I would say go to OF after you transplant out of a cup the first container.
then don't feed for 3-7 days depending on a lot Of variables, size of container, size of plant.
OF May be fine as a feed for a few weeks,
let the plant tell you when to hit it with real strong Nutes.
I watched a buddy Fail for a solid year, because I live a good drive away. I Couldn't offer any assistance.
like I said fail, no buds, but I brought him his soil and my hydro store suggested the pair of soils along with the Three main FF Nutes.
he grew lots of healthy useless ragweed.