1: u shoud have planted each seed individually.
2: your soil is over warered.
3: could you tell us the composition of your soil.
4: tell us about how are you providing the light?
5: you can keep them in full sun just make sure birds dont pick it.
6: if these are not auto you have to transplant them. never make such mistake.
7: where is perlite. if u cant get it get some river sand used in construction.
I like to make the soil with the fertilisers in (fish blood and bone, kelp etc) so I don't have to do any feeding at all, this way the plants feed themselves 🌞
But as a general rule of thumb feeding after 3 to 4 weeks and start with low doses 🌱
Good plan 👍 Can you get hold of fish 🐟 blood and bone meal, kelp meal (dried powdered sea weed) and vermiculite where you are?
Mycorrhizae are also a great addition to your mix 🍄 You've got dolomite lime already which is great 🌞
All look good but if you can fish blood and bone meal it would be better than the bone by itself
You've already got perlite? I saw you added to the seedling mix 👍
This is worth a look (below), not many options for fish blood and bone where you are, this seems the best value from what I can see