Takes more than overnight to kill the GW algae, then your filter must remove the dead algae cells. Make sure there is some floss in the filter, and clean it often, it can plug up with a big load of algae. Do more water changes, too. If you physically remove the algae (dead or alive) it is not there to plug up the filter.
Dead algae, decaying in the filter can cause problems, too.
In my experience with GW algae it will go away on its own. I had a bad case of it when I first set up a 28g tank. I think it was due to root tabs leaching out into the water column. I just let the tank do its thing, kept the lights on the normal 8 hrs/day.. and after a week or two the water cleared up on its own. The plants in the tank were fine throughout the whole ordeal.
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