Hi Alisha,
Thank you for explaining. I'm sorry if I was a little gruff last night.
You confused me when you quoted yourself. And, if you are planning to grow marijuana with your new knowledge, none of us will care.
It could be that you had trouble transplanting your seedlings when you were using soil because you transplanted them too small. You can let seedlings get relatively large and a little root bound before transplanting. Also, you pretty much destroy the pot you are taking them out of. The little plant 6-pack pots crumple easily so cut them apart and crumple them.
If you had an insect problem, there was probably not enough air circulation around your seedlings and you kept them too wet. That combination attracts thrips and gnats.
Your little trees still have a problem. I can't tell from your photos if the leaves are curling under because of insects or something else (too much water?). They do need more light.
What are you trying to accomplish with your growing knowledge of seed starting? Are the citrons an experiment for some project you have in mind? A citron farm in the backyard?
Hydroseed starting is usually used for starting plants for a hydroponic system. Is that what you are trying to do? Or are you starting seed to be eventually planted outside?
Daisy