Hello, Something is terribly wrong with my plants leaves I think!! I have four plants and one of plant's leaves started yellowing at the tips but now it's happening to every single one of my plants and their lower leaves look like they're dying ant the yellowing is spreading!! Can anybody PLEASE tell me what's going on and what I should do to save my plants???? I'm freaking out!! I'm attaching pictures but any advice would be greatly, greatly appreciated. Just btw, they're all under 6500K CLF bulbs that are about 3 inches from the top of the plants, the plants are all about 10 inches high, I have a fan on them constantly, the temperature in the room varies from about 70-80 degrees always and I give each plant about a cup and a half of water every 3-5 days and they're all in buckets that are about a foot tall and 10 inches wide at the top!!! AHHH I REALLY hope I'm not doing something wrong! Thank you so much in advance for anything you can tell me!!!!!!!!!