I use a 65 watt CF
bulb from home depot. I have to trim my chaeto back all the time (probably every other week) because it just grows super fast. You don't need much. Someone told me in another tread to keep the chaeto trimmed so it's evenly dispursed across the top. You don't want it getting so big that parts of the algae are in the dark basically cause they'll die off and release nitrates back into the system. But you probably already knew that.
Here's my fuge with the light on.
on a side note, i realized the other day that i should have put the fuge on the far right instead of in the middle. Water flows too quickly through it for pods
or anything to really be able to swim around in there. So that's going to be an all day project to switch that around