It is an imbalance some how. Sometimes the age of the tank could be in play. Did you used to dose any ferts? How often do water changes before 2 years ago and now?
Did you change the quantity of fish?
What type of plants do you have?
Also I am dealing with algae issues and recently read about dosing Seachem Flourish Excel which is a CO2
Check out if you think it could help you.
also was watching a good discussion about algae
Aquarium Co-op on YT
How to Get Rid of Aquarium Algae | Causes, Different Types, & Algae Eaters
I will PM you the link.
Other lights tend to lose some intensity of spectrums and allows others to be more intense. So maybe possible with LEDs.
New to FW fish? First tank in a long time or EVER??? Need some info on keeping fish?
Start here - Aquarium Advice Article
FW Favorites right now Clown Loaches, any shrimp - SW Vase Red Mangroves