Is this Normal

Here are my plants at like 3 weeks. i dont know which food source is best so one plant i give schults and the other is miracle grow and the third plant i mix a lil of each.... do i follow the feeding on the box ? or when the plants need it

Wow, some of those plants are very stretched.

not enough light to much stretch

Id be concentrating on getting better lighting or gettin your current light closer, theyre stretched, rather than worrying about nutes at this early stage.

feed about every week. start with 1/4 the recommended amount and build up slowly. better to get separate veg and bloom nutes from a hydro store than use mg or schults

what kind should get for bloom

any high "p" in n-p-k formula will work - like 5-10-5

how do i know when its time to repot

you can go ahead and repot now.

needs more light / better light and don't mist your plant leafs you might cause burn spots

Lights dude more lights,have a fan blowing on em to make them more stronger ?