It may have nothing to do with your nitrate... but i'd suggest checking it anyway! I check all my water levels weekly 
Also, is your tank in direct sunlight or right outside/facing a window? It probably is just algea... and you an get plenty of things to clear that up.
Whether it's a algea-eating fish, a snail (which i recommend entirely) or some chemicals.
Good luck.
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In my dreams I’m dying all the time, As I wake it’s kaleidoscopic mind, I never meant to hurt you, I never meant to lie, So this is goodbye, This is goodbye, Tell the truth you never wanted me, Tell me, In my dreams I’m jealous all the time, As I wake I’m going out of my mind, Going out of my mind... ♥
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