Is the bulb new? It looks stretchy, like a 12/12 from seed, not an autoflower.3 plants under 600w hps as close as it Can b without burning
I don't see a reason to flush. If anything, she looks hungry to me. Do you let it dry well between waterings? (Really well, like the container should feel very light when you lift it. No moisture when you dig your finger into the soil to the first knuckle.