Swampman
Aquarium Advice Activist
Hi I am having a problem with thread algae. I have done everything possible to at least get it under control. Now my thinking is the light. It is an LED that is 10 years old. If I do the math 9H/d x 365dx10y equal 32850 hours. Yes I clean the lens when I do water changes cover too. I have a newer LED that is brighter than the old one even when it was new. I haven't had any problem with hair algae until 2 years ago. What do you think?