Purple Cow IndiCanja and Gnats?

Plants dont care about green light so that is fine. For your soil, if you are worrier about gnats you uave a couple of options: 1) bake your soil in the oven to sterilise before you plant in case your soil is preloaded with eggs and larvae - baking can kill them - you will need to add new bacteria if you do this as it will kill your microbes 2) when you set up the pots you can do a H2O2 drench to (hopefully) kill eggs and larvae - again needs bacteria to be reintroduced cause this will kill your rainforest 3) get some neem oil for a drench 4) get some diatomaceous earth and sprinkly gently on the surface if you see adults - it rips them open and they die of dehydration 5) get some nematodes SF online (very cheap) mix the tip of a pins worth of powder in to some water and they will eat larvae 6) have some yellow sticky traps as a back up 7) they cant fly well so keep the fans on. That is fungus gnats finished. Hope you have a great grow! :)