A pretty standard led overhead light that is a good 8 inches above the water surface, on for 8 hours a day. I've been dosing with liquid ferts and have biological co2 running. No algae what so ever to my amazement. I suspect the spider plant sucks everything from the water judging by it's impeccable growth.
On that note I have a spider plant in good quality soil by the window and this one growing in pure aquaponics. Both were the same size plantlets at the start... the one in the aquarium is already massive in comparison!
Try increasing you light cycle to 12hrs.