Green water won’t go away

I have had an issue with green water for months. I moved my tank from one wall to another bc it was getting direct sunlight for the whole morning. Now it’s on the same wall as the window but gets indirect natural light. I only leave my tank light on at night from 6-10. I do water changes every 2 weeks. A month ago I started using root tabs for my live plants. I dont over feed my fish. Only once a day and skip one day out of the week. Any ideas besides a UV sterilizer go clear up my water? I’ve tried 3/4 water changes before only to see it turn green over time again. Also, I changed to a new filter over a month ago but made sure to leave the other filter media in the tank for a month before removing it.

37gal tank
2GBRs, Serpae Tetra, 2 Mollies, 5 sterbai corys
77 degree temp

 

Tank blockout worked for me. I left the light off and covered all sides and the top with cardboard and tape. A small area was left open so fish would still have the day / night cycle. It's ok to leave the top open for a short while when feeding. I think I did five days like this. It killed the algae and the fish were fine.

 

Your plants look pretty small. Can you remove them and give them somewhere else to live temporarily while you black out your tank? The blackout is needed to control the algae since you have so much that water changes won't work - it would just regrow.

 

If you want a quick fix, a UV sterilizer can work well.

 

Your plants look pretty small. Can you remove them and give them somewhere else to live temporarily while you black out your tank? The blackout is needed to control the algae since you have so much that water changes won't work - it would just regrow.

I was concerned about the plants too. Removing them might be a pain with the roots, however I need to do what’s necessary at this point. Would moving them in a bucket of tank water for 5 days save them? I don’t have a second tank.
Should I do a large water change then blackout for 5 days?

 

I try not to use chemicals in my tanks, but had the same problem for months in one of my tanks. All the others were fine. It was heavily planted and would be cloudy and green even after 50+ percent water changes. I tried reducing the lights, but it didn't work so I finally broke down and used API Algaefix. That took care of the problem.

 

I would like to try that if it wasn’t harmful to the fish. I’ll look into it

 

I would like to try that if it wasn’t harmful to the fish. I’ll look into it

I had read great things about it as well as horror stories, so was very hesitant. However, after months of massive water changes and lowered lights, I decided to try it. I had no adverse side effects. It takes a very small amount.
Stocking in that tank is goldfish and pleco.