The pennywort is nothing if not inconsistent. Some are losing all their leaves except their top leaves, some are spreading out along the gravel. . .
The anubias is relatively newish, so no algae to speak of. I did notice though that the pennywort that was growing tall and lanky had brown algae on it.
I found the label, it says that its 120 volt 18 watt. the bulb is fluorescent.