My cheato died :(

[Milad]

So why would my cheato die?
I have a grow lights made to grow plants i bought from RONA (60w) on a chamber in my sump. I also have some red algea in there (which also looks like its dieing) The light is on when the sun is down. aprox 10-12hours a day.

What could be causing my cheato to die off? There isnt much surface agitation where these guys are, its right next to the filter sock where my return comes in.