One bit of advice I can give you, but is too late now, is to fill your pots right to the top! This will not take up any more room in your tent and will provide much, much more room for the roots to grow. Your plants can only grow as big as their root system can provide for/support them. More root room means more plant growth. Try and keep the soil moist, but not wet. Deep watering to run off once in every few days is much much better than giving small amounts often, which really doesn't achieve much. The tap root even on these plants could already be 3-4 inches long and watering with a sprayer/syringe/shot glass etc is absolutely pointless, you should aim for having the entire volume of soil moist, from edge to edge, top to bottom. Watering only next to the stem will allow dry patches to form in your soil and this will prevent root "exploration"/expansion, make nutrients unavailable and possibly kill beneficial soil bacteria. It may seem strange watering at the edges when your plant is in the middle, but you have to think of the soil as one component in its entirety and not just think that the soil that matters is only right next to your plant. Think of your soil as an entire separate living entity, a township of interconnected beings that all rely on each other and water is the glue that holds it all together. Have a look at my diary "Cannabis Conundrums" to see the exposed root system of a 3 week old seedling and this may give you an idea as to why deep watering is essential for healthy root development and plant growth. You will also find many other interesting pictures there - leaf mutations and how to identify male and female plants and what a hermaphrodite can look like, amongst other bits and pieces. Wait until the top one to one and a half inches are dry before watering deeply again. Your index finger makes the perfect "moisture meter" and don't spend money on any sort of device that will give you the same information. You don't need it, your finger is perfect and it does not require batteries or calibration. I am not sure what the grids are on top of your pots in one of the pictures, but I would suggest removing them, as it will reduce the amount of light your plants are receiving, leading to stretched and slower and weaker growth.
Baby plants will not need feeding in soil for some weeks as they don't consume much. Start with quarter to half strength nutrients when they have 7-8 nodes and see how they take it. If all is ok, after a while/a few more nodes, go to half strength. Slightly underfeeding your plants is very easy to correct, however, rescuing burnt and damaged plants from over feeding is very very hard to correct. Also, leave all healthy green leaves on your plant and only remove any yellow ones. Your plants rely on every leaf they have, to provide the energy they need to grow.
Maximum amount of healthy green leaves = maximum amount of energy produced = maximum amount of growth.
Good luck and happy growing! And remember, there are no stupid questions and don't be afraid to ask them. Stupid is not asking, then having a failure!
Hope this helps,..... Organoman.