Seedling Growing Very Slowly

This is my 3rd grow but 1st Hydro endeavor. I'm using an ebb and flow system that I built.

I started my seed in a rapid rooter and once it had roots growing out the bottom, I transplanted to a 3.5 gallon pot full of rockwool. That was about 3 weeks ago and progress since then has been extremely slow. I thought it was the fact that the roots were taking hold in the bigger container but now I wonder if the Rockwool is too saturated. The leaves are drooping a bit, but it still looks very healthy. I've added some photos.

I've stopped watering for the time being. Any ideas? Thanks

Ebb and Flow
Rockwool
2-300W LED's
RO Distilled Water
No Nutrients Fed Yet

I think you may answered your question; the rock wool is too wet...

Fair enough. Transplanted into some new rockwool and have been watering, top-down for a bit. Now there are brown spots forming on the leaves. Should I stay the course or do you think there has been too much trauma to the seedling?

A 3.5 gallon pot is a finishing pot, not for new seedlings. When new seedlings first go into dirt they spend almost all their energy growing a root ball that will support the plant. Only after the roots grow to reach the inside of the pot do they revert to spending energy on growing greenery. In other words you should have a new seedling in a small cup or something like that. In a much smaller container the roots will soon reach the inside rim and receive the signal to grow above ground. I would transplant her and save yourself more weeks of watching nothing.

Good luck, BigSteve.

Thank you for that info. I just went ahead and transplanted in a smaller container.

In the meantime, the seedling has accumulated brown spots on several of the leaves. Is this a product of overwatering or something else?

Dont flood the pot more than once a day for now and add some nutes from the start. its easy to over water seedlings.

Droopy leaves from over watering