fertilizer, seed-buying, and safety questions

5:14 pm in Getting Started, Nutrients, questions by JulySundryGrandeur

I think I’m going to be spamming you guys up with lots of questions in the near future.

I have these two bottles of fertilizer, one for sprouts and leafy plants, and one for booming and fruiting plants. I know I’m supposed to start with one and later use the other. But do I switch entirely, start using both, or split them? What if I have tomatoes and peppers (the second bottle) in the same system as lettuce and chard (the first bottle)? I get the impression this is just the way hydroponic fertilizers come, so hopefully there is a standard answer.

What’s a decent place to order cheap seeds for plants I can’t find in stores? I am in the continental US. I could find a random place and try it, but I’m hoping one of you has actual experience.

How do I know if there’s something like salmonella in my system? You know, before anyone dies of it.