I prefer using the paper-towel method to sprout, then to a small pot, followed by a one-gallon. Next, depending on plant growth, it's going into a 2-gal, 3-gal, or 3.5-gal. Afterwards it will end up in a 5-gal or 7-gal. I don't use bigger because i like to start a lot of plants and see what pops up. I have over 5' plants in 7 gallon. I have smaller plants blooming in 3-gallon as well. I'm not using fertilizer's at all with fresh soil. I agree with the guy's. Individual containers are simpler for managing plants, organizing plants by size, and watering. Plants don't use water uniformly in soil. If you water everything at the same time for convenience-sake you'll have some water-logged plants. If you have the lights and other equipment just buy a bag of organic FF and some Perlite and mix it a little thinner. You can start countless small pots with a bag of soil and get them out to a couple months even in a gallon if you have to, then your soil will be ready. Even Happy Frog needs some Perlite IMO. I have had some plants burn in Ocean Forest and in Happy Frog. I'm going to do a worm-bin too. I bought a near-wreck of a house and I work on it every day so it's one thing at a time restarting all the cool stuff. Like a killer outdoor vegetable garden which I also grow from seeds. I sprout 100+ seeds indoor using my same grow chambers and equipment. We'll have chickens and rabbits again within a year too. With rabbits you need to keep a full-size hay bale which you spread around the hutch & ground to make it nicer. They eat it and poop on it. It all goes into compost with household foods, coffee grounds, etc.,. Between the chickens and rabbits and hay we had a fifteen year-old, ten-foot long compost pile up to two feet high and four feet wide. I'd throw in a few additional bags of chicken manure every year for kicks. The pile had a beetle colony of inch-long, iridescent-green, flying beetles which bombarded the neighborhood every fall. They fly crazy and look like insane, giant, possibly stinging insects. It "freaks out the squares", in the words of Homer Simpson. Men ran. Women and kids screamed. There could be ten or fifteen swarming all over like giant angry bees. The larvae were man-thumb-sized after first appearing at pea-size, and burrowed in tunnels many feet underground below the compost pile into hard clay. I used to pull seven wheelbarrows a year out for my outdoor garden and virtually never turned it to avoid hurting the beetles. Them and the worms did the work. The chickens would fight over eating any larvae that turned up. It was organic. No fertilizer's. No sprays. And it turned the clay soil into usable soil. Sorry, i'm a blabbermouth. I use a keyboard. I write a lot. I've grown weed and vegetables 35+ years and raised three great kids. Hence the rabbits, chickens, dog, and countless small critters. We used to raise and release native frogs for instance. You think growing weed is tough? Try to figure out tree frogs from eggs to full-grown, loudly-croaking, nightly, neighborhood nuisances like you live next to a creek. We would save eggs from roadside puddles as Spring heated up the water, and release countless hundreds as frogs.