what does algae look like in a reservoir

It will be slimmy color differs. But a good sign is if it smells like a dirty fish tank.
I think i had a little bit of algae in my reservoir from the superthrive i put in there. i cleaned and replaced my reservoir and flushed the plants with water a little but not much. Do you think that caused a problem?
 
algae can be brown too. I know Algae needs light* to grow, so if that's the issue you must be having light getting in the tank.
 
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