Thats what i figured. But the brown algae though....im confused about that. I read a thread (if I can find it again I'll post it) about someone doing a test on their tank where the brown algae was decreased by his led lights and this link (which i hope post well) claims "proper lighting" is a way to combat it. If that's true or not, what would the problem be if you have it?If you’re using TSS then the light will kill free floating bacteria, in no case will having the light on speed up the process as the bacteria you want do not require light to feed and grow. Also UV or not, you’re bacteria are safe within your filtration so the light won’t harm them once they begin to grow. If there isn’t light in your aquarium no algae will grow, as it requires light to photosynthesize.