I am growing lemon trees from seeds I got in a drink from a bar. They are growing nicely and I have 8 trees. But over the past few weeks I have noticed yellow spots on some of the leaves. No leaves have fallen off yet but I am stumped on what is causing this, and what I should do, if anything. They are indoors next to my brightest window and still pretty small plants but very leafy. I water once a week if needed and let the water drain properly, lightly mist them early morning daily, and I use miracle- gro as instructed... Please help I'm very attached to them now.