the round leaves are just the seed leaves, not to sure on spelling but their called cotlydon leaves, these are what the plant uses to produce its first set of true leave, so after the round leaves you will have single bladed leaves that look more like cannabis leaves,
dont mess about with them to much, if they been knocked over this would of damaged the roots so might be stressed for a day or 2, another problem i see you having is transplanting as you will need them in bigger pots and with the soil that low down its going to be difficult to tip them upside down to let them fall out so they can be replanted, id do it very caregully but wait until their a decent size so the root mass holds the soil together, we can give you a good idea when their ready but you got a week or 2 before then,
try not to over water, at this stage its very easy to kill them by over watering, if their over watered the leaves will look swollen and wrinkle up slightly, if the roots then start to rot the leaves will start to go a light green colour then a yellow colour then die, so let the pots pretty much dry out before you water next, you dony have drain holes so only use a little amount of water when you do water,
the roots need oxygen as much as they do water, so when their over watered the root gets no oxygen and this then starves the plant, so keep an eye on how wet the soil is and water when its nearly dry, this also encourages roots to grow a they are trying to find the moisture,
low stress training is something i use often, depending on your size you could do any sort of lst, but when you are in the final grow space id make sure the bottom is compost from side to side and front to back so you are giving the plants plenty of root space, the small pots wont allow the plants to grow much, to keep the plants smaller and bushier than give them plenty of soil in area but dont go to deep, once the roots stop growing down they will grow sideways to fill the soil, this will help keep the plants smaller and bushier so will help with height,
if i was growing in a comp case then id have about 3 or 4 inches of soil that covers the whole of the bottom of the grow space, that gives maximum space for roots to grow, then id use just 1 plant and plant it as close to the one end as possible, then id use low stress training to train the plant to grow sideways so it is growing towards the other end of the grow space, then each node will have 2 branches, so these will grow up and become the top of the plant, so you could easily have 8 to 10 main cola using lst, the canopy would be nice and even the same as a scrog but as the grow area is small i dont think you will even need a scrog, im sure low stress training will work perfect and produce great results for the size of grow space,
all id make sure is that i transplanted it so it was planted right at one end of the space so its pretty much touching the wall, then id use some string and something heavy like a bolt or something that would hold the plant down, then just train the main stem to grow just an inch above soil level and grow it totally sideways so it runs flat till it reaches the other end of the grow space, i think this method would work very well, its the method i would use but it depends on the size of the final grow space,
its going to be interesting to see what you can come up with
