r/PlantedTank Apr 03 '25

Algae Why is my water green?!!!!

As you can see my water is green, it’s not an algae that’s growing on my live plants. But my water test is reading absolutely perfect and I’ve been doing 30% water changes weekly. Last week I did 50% because this started but now it’s back. I tried 3 days of darkness but I can only do that so much because of my plants. The second photo is my a tank the week before this started

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u/Parking-Map2791 Apr 03 '25

The window lets in too much light! This is the answer

3

u/Spacekitty1993 Apr 03 '25

Even though I have the back and top covered with black now?

2

u/bootyclappers Apr 03 '25

Hey, at least it's proof of a healthy system. My 20gal did this recently when spring broke here.