Silicates, Phosphates, Nitrates and lighting all play a major role in the growth of diatoms, There area things to consider to help eliminate, control, or better yet, avoid them as much as possible.r
What Kelvin rating are your bulbs, because anything under 6700k will increase algae growth. Even if you cut back on lighting, less hours will only help it.
Use ONLY RO/DI water, Never tap water. Tap water is full of silicates and phosphates!
You can always add a Fighting Conch to eat the diatoms on your sand bed,
Plus, your skimmer will aid along the way, removing nutrients from the water!