I have a 10w 50/50 bulb in the hood, it's a 5g marineland hex. And I dose 3x a week with micro verts and target feed once a week. The bioload is small and I only noticed the bulges tonight when I got home from work and inspected my tanks and since the main head had withdrawn they were noticeable. When the main head is open its huge. And thanks for confirming what I was hoping