First Ever Grow!! 5 plants 2x4

Week 2 has been concerning. I noticed little white larvae in the topsoil, and some small brown spots on older growth on 2 of the plants. I used a 30x magnifier to check under leaves, no visible mites or anything else crawling. I've ordered some neem oil to treat all the plants and the soil, should be here this Friday. Until then, I've been trying to only give enough water to keep them alive, hoping that drying the top of the soil out will help slow down whatever critter is in the soil til the neem oil gets here. Hopefully the neem oil doesnt hurt my super soil plants too much. I topped the random bag seed the beginning of this week, on 4/17. The other 2 super soil plants were topped yesterday morning, 4/22. Hopefully the other 2 plants don't get decimated by whatever bug i have, they seem to be growing MUCH slower than the other plants. I plan on keeping 4 main colas, however the grape punch seems to naturally want to bush out, so i might let one. Did some minor pruning of older fan leaves once plants were topped. I don't plan on doing any other training from this point beyond LST to keep canopy even, and topping the other 2 plants once they get a few more nodes. Other than that, I'm just waiting for them all to get about 1.5ft tall then flip to 12/12