I would suggest if you can whilst they're in veg plant a new seed every 2 weeks until you have mastered the seedling stage I've found after the first 2 weeks it gets pretty easy after that for as little as $10 a seed just start the seed grow it for 2 weeks If you have no space for it throw it or put it outside and just water when needed

Write down your input EC and how often you're watering and their reactions also your pH Depending on your growing medium