You can edit your post and title after you have made it. You don't need excuses, next time you don't fix something like this, I will just delete your thread without warning. Please make a proper and detailed title.
It's best to make Chlorophyte farms in your hellevator, at cavern layer or lower, make a mud rectangle 6x7 with a chlorophyte ore somewhere in the center. Each mud rectangle must have a gap of at least 70 tiles from each other, those are pretty much the important details. Hellevator Chlorophyte farm: https://i.imgur.com/HT5P2LJ.jpg Underworld Chlorophyte farm: https://i.imgur.com/NxyBuI4.jpg