mushrooms might be taking up nutrients your plant could use. they won't do anything to your plants unless you let them decompose in the soil, then you better make sure there not magic shrooms. if your plants budding all the nutrients it gets go straight to the buds. that means you might get a...
well if it's not thick enough, it could be your light is a incandensent light, which makes the stem grow to fast for how strong it is.. if not then make sure theres enough potasium in your fertilizer.