serious green water "needs fix"

[HaZRaTTy]

IMO - One of the most successful ways to remove an algae out break like you have explained would be to do a 30% WC - Black out for 3 days (Don't worry about feeding as your fish will be fine) and another 30% WC after that. You should be good to go.

I'm sure you already know the causes as you suggested the bad bulb, longated photo period, and possibly to much direct sunlight from a window etc.

This is just what I have done in the past and it has always been sucessful. UV sterilizers will work as well but if you have a larger tank a UV big enough to treat your water to the point you want it to would cost a nice chunk, when that money could be put back into your system for other things.